diff --git a/chunk_text.py b/chunk_text.py
index cb8668e..42f3e91 100644
--- a/chunk_text.py
+++ b/chunk_text.py
@@ -24,6 +24,7 @@ import threading
 import aiofiles
 import httpx
 import logging
+from resetlevel import reset_textlevel
 from rapidocr_onnxruntime import RapidOCR
 from PIL import Image, ImageOps, UnidentifiedImageError
 from config import (
@@ -51,6 +52,8 @@ _image_ocr_cache: Dict[str, str] = {}
 _image_ocr_cache_lock = threading.Lock()
 _api_url_inflight = [0] * len(API_URLS)
 _api_url_lock = threading.Lock()
+IMAGE_OCR_PREFIX = "图片中文本内容为："
+IMAGE_OCR_PREFIXES = (IMAGE_OCR_PREFIX, "图片包含的文字内容为：")
 
 
 def _image_mime_type(suffix: str) -> str:
@@ -250,7 +253,7 @@ def extract_image_text_sync(image_path: Union[str, PathLib]) -> dict:
         ocr_result, elapse = ocr_engine(resolved_path)
 
     texts = [item[1] for item in (ocr_result or [])]
-    full_text = "图片包含的文字内容为：" + ",".join(texts) if texts else ""
+    full_text = IMAGE_OCR_PREFIX + ",".join(texts) if texts else ""
     with _image_ocr_cache_lock:
         _image_ocr_cache[resolved_path] = full_text
     return {
@@ -261,7 +264,7 @@ def extract_image_text_sync(image_path: Union[str, PathLib]) -> dict:
 
 
 def build_image_markdown_with_ocr(markdown_image: str, local_image_path: Optional[PathLib]) -> str:
-    if "图片包含的文字内容为：" in markdown_image:
+    if any(prefix in markdown_image for prefix in IMAGE_OCR_PREFIXES):
         return markdown_image
     if not local_image_path:
         return markdown_image
@@ -278,6 +281,179 @@ def build_image_markdown_with_ocr(markdown_image: str, local_image_path: Optiona
     return f"{markdown_image}\n{ocr_full_text}"
 
 
+async def get_image_ocr_text(local_image_path: Optional[PathLib]) -> str:
+    if not local_image_path:
+        return ""
+
+    try:
+        ocr_data = await extract_image_text(local_image_path)
+    except Exception as exc:
+        logger.warning(f"Failed to OCR local image {local_image_path}: {exc}")
+        return ""
+
+    return (ocr_data.get("full_text") or "").strip()
+
+
+def stringify_content_field(value: Any) -> str:
+    if value is None:
+        return ""
+    if isinstance(value, list):
+        return "\n".join(str(item) for item in value if str(item).strip())
+    if isinstance(value, dict):
+        return json.dumps(value, ensure_ascii=False)
+    return str(value)
+
+
+def clean_table_body(table_body: Any) -> str:
+    table_body = stringify_content_field(table_body)
+    for pattern in [' colspan="1"', ' rowspan="1"', " colspan='1'", " rowspan='1'", " colspan=1", " rowspan=1"]:
+        table_body = table_body.replace(pattern, "")
+    return table_body
+
+
+def join_nonempty_parts(*parts: Any) -> str:
+    return "\n".join(part for part in (stringify_content_field(part).strip() for part in parts) if part)
+
+
+def record_to_chunk_text(ins: Dict[str, Any]) -> str:
+    record_type = ins.get("type")
+    ocr_text = ins.get("ocr_text", "")
+
+    if record_type == "text":
+        text = stringify_content_field(ins.get("text", ""))
+        level = ins.get("text_level")
+        if level is not None and isinstance(level, int) and level > 0:
+            text = "#" * min(level, 6) + " " + text
+        return join_nonempty_parts(ocr_text, text)
+
+    if record_type == "table":
+        return join_nonempty_parts(
+            ocr_text,
+            ins.get("table_caption"),
+            clean_table_body(ins.get("table_body", "")),
+            ins.get("table_footnote"),
+        )
+
+    if record_type == "image":
+        return join_nonempty_parts(
+            ocr_text,
+            ins.get("image_caption"),
+            ins.get("img_path"),
+            ins.get("image_footnote"),
+        )
+
+    if record_type == "chart":
+        return join_nonempty_parts(
+            ocr_text,
+            ins.get("chart_caption"),
+            ins.get("content"),
+            ins.get("img_path"),
+            ins.get("chart_footnote"),
+        )
+
+    if record_type == "equation":
+        return join_nonempty_parts(
+            ocr_text,
+            ins.get("text"),
+            ins.get("img_path"),
+        )
+
+    if record_type == "code":
+        return join_nonempty_parts(
+            ocr_text,
+            ins.get("code_caption"),
+            ins.get("code_body"),
+            ins.get("code_footnote"),
+        )
+
+    if record_type == "list":
+        return join_nonempty_parts(ocr_text, ins.get("list_items"))
+
+    if record_type in {"discarded", "header", "footer", "page_number"}:
+        return join_nonempty_parts(ocr_text, ins.get("text"))
+
+    return join_nonempty_parts(ocr_text, ins.get("text"))
+
+
+def is_supported_chunk_record(ins: Dict[str, Any]) -> bool:
+    return ins.get("type") in {
+        "text",
+        "table",
+        "image",
+        "chart",
+        "equation",
+        "code",
+        "list",
+        "discarded",
+        "header",
+        "footer",
+        "page_number",
+    }
+
+
+def append_caption_ocr(ins: Dict[str, Any], ocr_texts: List[str]) -> None:
+    caption_field = {
+        "image": "image_caption",
+        "table": "table_caption",
+        "chart": "chart_caption",
+        "code": "code_caption",
+    }.get(ins.get("type"))
+    if not caption_field:
+        caption_field = "ocr_text"
+
+    caption = ins.get(caption_field, [])
+    existing_text = stringify_content_field(caption)
+    if caption_field == "ocr_text":
+        existing_text = join_nonempty_parts(existing_text, ins.get("text"))
+
+    additions = []
+    for text in ocr_texts:
+        text = (text or "").strip()
+        text_without_prefix = text
+        for prefix in IMAGE_OCR_PREFIXES:
+            if text_without_prefix.startswith(prefix):
+                text_without_prefix = text_without_prefix[len(prefix):].strip()
+                break
+
+        if (
+            text
+            and text not in existing_text
+            and text_without_prefix not in existing_text
+            and text not in additions
+        ):
+            additions.append(text)
+
+    if not additions:
+        return
+
+    if caption_field == "ocr_text":
+        ins[caption_field] = join_nonempty_parts(additions, caption)
+        return
+
+    if isinstance(caption, list):
+        ins[caption_field] = additions + caption
+    elif caption is None or not str(caption).strip():
+        ins[caption_field] = additions
+    else:
+        ins[caption_field] = "\n".join(additions) + "\n" + str(caption).lstrip()
+
+
+def build_image_markdown(markdown_or_path: str, prefix: str) -> Tuple[str, Optional[PathLib]]:
+    img_path = str(markdown_or_path).strip()
+    if not img_path:
+        return "", None
+
+    if img_path.strip().startswith("!["):
+        return img_path, resolve_local_image_path(img_path)
+
+    p = PurePosixPath(img_path)
+    if p.parts and p.parts[0] == "images":
+        relative_path = str(PurePosixPath(*p.parts[1:]))
+        return f"![图片]({prefix}{relative_path})", resolve_local_image_path(relative_path)
+
+    return f"![图片]({prefix}{img_path})", resolve_local_image_path(img_path)
+
+
 def image_base64_to_data_url(image_base64: Union[str, bytes], suffix: str) -> str:
     if isinstance(image_base64, bytes):
         raw = base64.b64encode(image_base64).decode("ascii")
@@ -602,75 +778,13 @@ def split_content_bbox(data, max_length=8000):
         bbox = ins.get("bbox")
         page_idx = ins.get("page_idx", -1) 
 
-        new_text = ""
-        should_record_highlight = False  # 标记是否需要记录 highlight（即使 new_text 为空）
+        if not is_supported_chunk_record(ins):
+            continue
 
-        if ins["type"] == "text":
-            text = ins.get("text", "")
-            level = ins.get("text_level")
-            if level is not None and isinstance(level, int) and level > 0:
-                text = "#" * min(level, 6) + " " + text  # 安全限制标题级别
-            new_text = text + "\n"
-            should_record_highlight = True
-
-        elif ins["type"] == "table":
-            table_caption = ins.get("table_caption")
-            table_body = ins.get("table_body", "")
-
-            # 清理冗余属性
-            for pattern in [' colspan="1"', ' rowspan="1"', " colspan='1'", " rowspan='1'", " colspan=1", " rowspan=1"]:
-                table_body = table_body.replace(pattern, "")
-
-            caption_str = ""
-            if table_caption:
-                if isinstance(table_caption, list):
-                    caption_str = "\n".join(str(c) for c in table_caption)
-                else:
-                    caption_str = str(table_caption)
-
-            # 判断是否有实质内容
-            has_caption = bool(caption_str.strip())
-            has_body = bool(table_body.strip())
-
-            if has_caption or has_body:
-                new_text = caption_str + ("\n" if has_caption else "") + table_body + "\n"
-            else:
-                new_text = ""  # 空内容，不拼接
-
-            # 即使内容为空，只要是 table 类型，就记录 highlight（满足你的需求）
-            should_record_highlight = True
-
-        elif ins["type"] == "image":
-            image_caption = ins.get("image_caption", "")
-            img_path = ins.get("img_path", "")
-
-            if isinstance(image_caption, list):
-                image_caption = "\n".join(str(item) for item in image_caption)
-            elif not isinstance(image_caption, str):
-                image_caption = str(image_caption)
-
-            if isinstance(img_path, list):
-                img_path = "\n".join(str(p) for p in img_path)
-            elif not isinstance(img_path, str):
-                img_path = str(img_path)
-
-            if image_caption.strip() or img_path.strip():
-                new_text = image_caption + "\n" + img_path + "\n"
-            else:
-                new_text = ""
-
-            should_record_highlight = True
-
-        elif ins["type"] == "discarded":
-            text = ins.get("text", "")
-            if text.strip():
-                new_text = text + "\n"
-            else:
-                new_text = ""
-            should_record_highlight = True
-
-        else:
-            continue  # 不支持的 type，跳过且不记录 highlight
+        new_text = record_to_chunk_text(ins)
+        if new_text.strip():
+            new_text += "\n"
+        should_record_highlight = True
 
         # --- 关键：即使 new_text 为空，只要 should_record_highlight 为 True，就要处理 chunk 切分和 highlight 记录 ---
 
@@ -707,7 +821,7 @@ def split_content_bbox(data, max_length=8000):
 
 
 
-def group_records(records):
+def _group_records_without_parent_context(records):
     result = []
     current_group = []
 
@@ -728,10 +842,50 @@ def group_records(records):
 
     return result
 
+
+def _get_group_level(group):
+    if not group:
+        return None
+
+    level = group[0].get("text_level")
+    if isinstance(level, int) and level > 0:
+        return level
+    return None
+
+
+def group_records(records):
+    """
+    Split records by text_level, then prepend ancestor section content.
+
+    For example, a text_level=2 section will include the nearest text_level=1
+    group content before its own content. A text_level=3 section will include
+    the nearest level 1 and level 2 group content before its own content.
+    """
+    base_groups = _group_records_without_parent_context(records)
+    result = []
+    section_stack = []  # [(level, merged_group)]
+
+    for group in base_groups:
+        level = _get_group_level(group)
+        if level is None:
+            result.append(group)
+            continue
+
+        while section_stack and section_stack[-1][0] >= level:
+            section_stack.pop()
+
+        parent_group = section_stack[-1][1] if section_stack else []
+        merged_group = parent_group + group
+        result.append(merged_group)
+        section_stack.append((level, merged_group))
+
+    return result
+
+
 def get_chunk_bbox_otherfile(data, max_length=8000):
     """
-    处理没有 bbox 信息的文件数据（主要面向纯表格类内容）。
-    每个 table 作为一个独立切片，不与其他记录拼接。
+    处理没有 bbox 信息的文件数据。
+    每条支持的记录作为一个独立切片，不与其他记录拼接。
     
     - 单个 table 内容超过 max_length 时，调用 chunk_reset 在 </tr> 处安全切分，
       切分后的多个 chunk 共享同一组 positions
@@ -743,38 +897,14 @@ def get_chunk_bbox_otherfile(data, max_length=8000):
     slices = []
 
     for ins in data:
-        if ins.get("type") != "table":
+        if not is_supported_chunk_record(ins):
             continue
 
         page_idx = ins.get("page_idx", -1)
         bbox = ins.get("bbox", [])
-
-        table_caption = ins.get("table_caption")
-        table_body = ins.get("table_body", "") or ""
-
-        # 清理冗余属性
-        for pattern in [
-            ' colspan="1"', ' rowspan="1"',
-            " colspan='1'", " rowspan='1'",
-            " colspan=1", " rowspan=1",
-        ]:
-            table_body = table_body.replace(pattern, "")
-
-        # 拼接 caption
-        caption_str = ""
-        if table_caption:
-            if isinstance(table_caption, list):
-                caption_str = "\n".join(str(c) for c in table_caption)
-            else:
-                caption_str = str(table_caption)
-
-        has_caption = bool(caption_str.strip())
-        has_body = bool(table_body.strip())
-
-        if not (has_caption or has_body):
-            continue  # 空表格跳过
-
-        content = caption_str + ("\n" if has_caption else "") + table_body
+        content = record_to_chunk_text(ins)
+        if not content.strip():
+            continue
         positions = [{"page_idx": page_idx, "bbox": bbox}]
 
         # 单表超长 → 在 </tr> 处切分，多个 chunk 共享 positions
@@ -875,38 +1005,11 @@ def get_chunk_bbox(data):
             bbox = ins["bbox"]
             positions = [{"page_idx": page_idx, "bbox": bbox}]
 
-            if ins["type"] == "text":
-                if ins.get("text_level"):
-                    text = ins.get("text", "")
-                    level = ins.get("text_level")
-                    content = "#" * level + text
-                else:
-                    content = ins.get("text", "")
-            elif ins["type"] == "table":
-                content = (ins.get("table_caption") or "") + "\n" + (ins.get("table_body") or "")
-            elif ins["type"] == "image":
-                image_caption = ins.get("image_caption", [])
-                img_path = ins.get("img_path", [])
+            if not is_supported_chunk_record(ins):
+                continue
 
-                # 如果 image_caption 是列表，则将其转换为字符串
-                if isinstance(image_caption, list):
-                    image_caption = "\n".join(str(item) for item in image_caption)
-                elif not isinstance(image_caption, str):
-                    image_caption = str(image_caption)
-
-                # 如果 img_path 是列表，则将其转换为字符串
-                if isinstance(img_path, list):
-                    img_path = "\n".join(str(p) for p in img_path)
-                elif not isinstance(img_path, str):
-                    img_path = str(img_path)
-
-                if image_caption.strip() or img_path.strip():
-                    content = (image_caption or "") + "\n" + (img_path or "")
-                else:
-                    continue  # 跳过空图像项
-            elif ins["type"] == "discarded":
-                content = ins.get("text", "")
-            else:
+            content = record_to_chunk_text(ins)
+            if not content.strip():
                 continue
 
             slices.append({"content": content, "positions": positions})
@@ -977,7 +1080,7 @@ def split_text_preserve_sentences(text, max_length=7500):
 
     return chunks
 
-def data_replace(data, prefix):
+async def data_replace(data, prefix):
     """
     遍历 data 列表，若元素包含 'img_path' 字段，则移除前缀 'images/' 并拼接新前缀。
     使用 pathlib 安全处理路径。
@@ -985,32 +1088,27 @@ def data_replace(data, prefix):
     for ins in data:
         if isinstance(ins, dict) and "img_path" in ins:
             img_path = ins["img_path"]
+            local_image_paths = []
             if isinstance(img_path, list):
-                ins["img_path"] = "\n".join(
-                    data_replace([{"img_path": str(item)}], prefix)[0]["img_path"]
-                    for item in img_path
-                    if str(item).strip()
-                )
-                continue
-
-            img_path = str(img_path)
-            if img_path.strip().startswith("!["):
-                local_image_path = resolve_local_image_path(img_path)
-                ins["img_path"] = build_image_markdown_with_ocr(img_path, local_image_path)
-                continue
-
-            p = PurePosixPath(img_path)
-            # 如果以 images/ 开头，去掉第一级目录
-            if p.parts and p.parts[0] == "images":
-                relative_path = str(PurePosixPath(*p.parts[1:]))
-                markdown_image = f"![图片]({prefix}{relative_path})"
-                local_image_path = resolve_local_image_path(relative_path)
-                ins["img_path"] = build_image_markdown_with_ocr(markdown_image, local_image_path)
+                markdown_images = []
+                for item in img_path:
+                    if not str(item).strip():
+                        continue
+                    markdown_image, local_image_path = build_image_markdown(str(item), prefix)
+                    markdown_images.append(markdown_image)
+                    if local_image_path:
+                        local_image_paths.append(local_image_path)
+                ins["img_path"] = "\n".join(markdown_images)
             else:
-                # 否则保留原路径（或按需处理）
-                markdown_image = f"![图片]({prefix}{img_path})"
-                local_image_path = resolve_local_image_path(img_path)
-                ins["img_path"] = build_image_markdown_with_ocr(markdown_image, local_image_path)
+                markdown_image, local_image_path = build_image_markdown(str(img_path), prefix)
+                ins["img_path"] = markdown_image
+                if local_image_path:
+                    local_image_paths.append(local_image_path)
+
+            ocr_texts = await asyncio.gather(
+                *(get_image_ocr_text(path) for path in local_image_paths)
+            )
+            append_caption_ocr(ins, ocr_texts)
     return data
 
 def filter_content_bbox(data, max_length=3000):
@@ -1034,45 +1132,15 @@ def filter_content_bbox(data, max_length=3000):
         if "type" not in ins:
             continue
 
-        added_content = ""
         bbox = ins.get("bbox", [])
         page_idx = ins.get("page_idx", -1)
 
-        if ins["type"] == "text":
-            text_content = ins.get("text", "")
-            added_content = text_content + "\n"
+        if not is_supported_chunk_record(ins):
+            continue
 
-        elif ins["type"] == "table":
-            table_caption = ins.get("table_caption")
-            table_body = ins.get("table_body")
-
-            caption_str = ""
-            if table_caption:
-                if isinstance(table_caption, list):
-                    caption_str = "\n".join(str(c) for c in table_caption)
-                else:
-                    caption_str = str(table_caption)
-
-            added_content = caption_str + "\n" + (table_body or "") + "\n"
-
-        elif ins["type"] == "image":
-            image_caption = ins.get("image_caption", "")
-            img_path = ins.get("img_path", "")
-
-            if isinstance(image_caption, list):
-                image_caption = "\n".join(str(item) for item in image_caption)
-            elif not isinstance(image_caption, str):
-                image_caption = str(image_caption)
-
-            if isinstance(img_path, list):
-                img_path = "\n".join(str(p) for p in img_path)
-            elif not isinstance(img_path, str):
-                img_path = str(img_path)
-
-            if image_caption or img_path:
-                added_content = image_caption + "\n" + img_path + "\n"
-            else:
-                continue  # 跳过空图像项
+        added_content = record_to_chunk_text(ins)
+        if added_content.strip():
+            added_content += "\n"
         else:
             continue
 
@@ -1319,7 +1387,8 @@ async def process_pdf_file(pdf_path: Path, image_prefix: str,filename:str) -> Op
     if doc_result is not None:
         content_list, images = doc_result
         if content_list and images:
-            replaced_content_list = data_replace(content_list, image_prefix)
+            replaced_content_textlevel = reset_textlevel(content_list)
+            replaced_content_list = await data_replace(replaced_content_textlevel, image_prefix)
             slices = get_chunk_bbox(replaced_content_list)
             slices_check = chunk_check(slices, 8000)
             slices_check = merge_short_slices(slices_check, min_length=30,filename=filename) 
@@ -1342,7 +1411,8 @@ async def process_pdf_file(pdf_path: Path, image_prefix: str,filename:str) -> Op
         data = result.get("data", {})
         content_list = data.get("content_list", [])
         images = data.get("images", {})
-        replaced_content_list = data_replace(content_list, image_prefix)
+        replaced_content_textlevel = reset_textlevel(content_list)
+        replaced_content_list = await data_replace(replaced_content_textlevel, image_prefix)
         slices = get_chunk_bbox(replaced_content_list)
         slices_check = chunk_check(slices, 8000)
         slices_check = merge_short_slices(slices_check, min_length=30,filename=filename) 
@@ -1367,7 +1437,8 @@ async def process_other_file(pdf_path: Path, image_prefix: str, filename: str) -
     if doc_result is not None:
         content_list, images = doc_result
         if content_list and images:
-            replaced_content_list = data_replace(content_list, image_prefix)
+            replaced_content_textlevel = reset_textlevel(content_list)
+            replaced_content_list = await data_replace(replaced_content_textlevel, image_prefix)
             slices = get_chunk_bbox(replaced_content_list)
             slices_check = chunk_check(slices, 8000)
             return {"slices": slices_check, "images": images}
@@ -1397,7 +1468,8 @@ async def process_other_file(pdf_path: Path, image_prefix: str, filename: str) -
         images = data.get("images", {})
         
         # 后续的数据替换与切片处理逻辑
-        replaced_content_list = data_replace(content_list, image_prefix)
+        replaced_content_textlevel = reset_textlevel(content_list)
+        replaced_content_list = await data_replace(replaced_content_textlevel, image_prefix)
         slices = get_chunk_bbox(replaced_content_list)
         slices_check = chunk_check(slices, 8000)
 
@@ -1415,7 +1487,7 @@ async def process_other_file(pdf_path: Path, image_prefix: str, filename: str) -
         
 if __name__ == "__main__":
 
-    filepath = r"E:\ZKYNLP\Hjunproject\project0506\kgrag\122-06A0014-B01001_发动机-维修手册_content_list.json"
+    filepath = r"E:\ZKYNLP\Hjunproject\project0506\kgrag\舰船抗沉损管训练仿真系统研究_content_list.json"
     try:
         with open(filepath, 'r', encoding='utf-8') as file:
             data = json.load(file)
@@ -1425,12 +1497,12 @@ if __name__ == "__main__":
     # print(len(data))
     start_chars = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "第", "十",
                    "一", "二", "三", "四", "五", "六", "七", "八", "九"]
-
-    data = data_replace(data=data,prefix="/api/v1/knowledge/files/images/")
+    replaced_content_textlevel = reset_textlevel(data)
+    data = asyncio.run(data_replace(data=replaced_content_textlevel,prefix="/api/v1/knowledge/files/images/"))
     slices = get_chunk_bbox(data=data)
     slices_1 =chunk_check(slices, 8000)
     slices_2 = merge_short_slices(slices_1, min_length=30)   # ← 新增这一行
 
 
-    for ins in slices_2:
+    for ins in slices_2[:30]:
         print(ins)
diff --git a/resetlevel.py b/resetlevel.py
new file mode 100644
index 0000000..cae52e7
--- /dev/null
+++ b/resetlevel.py
@@ -0,0 +1,184 @@
+import copy
+import json
+import re
+import sys
+from typing import Any
+
+
+CN_NUM = "\u4e00\u4e8c\u4e09\u56db\u4e94\u516d\u4e03\u516b\u4e5d\u5341\u767e\u5343\u4e07\u3007\u96f6\u4e24"
+
+CHAPTER_PATTERN = re.compile(rf"^\s*\u7b2c\s*([{CN_NUM}\d]+)\s*\u7ae0")
+CN_LEVEL1_PATTERN = re.compile(rf"^\s*([{CN_NUM}]+)(?=\s|[\u3001\u3002\uff0e.])")
+
+CASE_LIKE_PATTERN = re.compile(r"^\s*\d+(?:\.|\uff0e)(?!\d|\s|$)")
+ARABIC_PATTERN = re.compile(
+    r"^\s*(\d+(?:\.\d+)*)(?=\s|[\u4e00-\u9fff\u3001\u3002\uff0e]|$|\.(?:\s|$))"
+)
+
+
+def has_valid_text_level(item: dict) -> bool:
+    return "text_level" in item and item.get("text_level") not in (None, "")
+
+
+def parse_heading(text: str):
+    text = text.strip()
+    if not text:
+        return None, None
+
+    if CASE_LIKE_PATTERN.match(text):
+        return "case_like", None
+
+    if CHAPTER_PATTERN.match(text):
+        return "level1", None
+
+    if CN_LEVEL1_PATTERN.match(text):
+        return "level1", None
+
+    match = ARABIC_PATTERN.match(text)
+    if match:
+        return "arabic", match.group(1)
+
+    return None, None
+
+
+def arabic_depth(number: str) -> int:
+    return number.count(".") + 1
+
+
+def parent_number(number: str) -> str | None:
+    parts = number.split(".")
+    if len(parts) <= 1:
+        return None
+    return ".".join(parts[:-1])
+
+
+def collect_headings(data: list) -> list:
+    headings = []
+
+    for item in data:
+        if not isinstance(item, dict):
+            continue
+        if item.get("type") != "text":
+            continue
+        if not has_valid_text_level(item):
+            continue
+
+        kind, number = parse_heading(item.get("text", ""))
+        if kind in {"level1", "arabic", "case_like"}:
+            headings.append({"kind": kind, "number": number})
+
+    return headings
+
+
+def is_valid_arabic_hierarchy(numbers: list[str], allow_missing_depth1_parent: bool) -> bool:
+    seen = set()
+    has_depth2 = False
+    has_depth3 = False
+
+    for number in numbers:
+        depth = arabic_depth(number)
+        if depth >= 2:
+            has_depth2 = True
+        if depth >= 3:
+            has_depth3 = True
+
+        parent = parent_number(number)
+        if parent is not None:
+            parent_depth = arabic_depth(parent)
+            parent_is_missing_depth1 = allow_missing_depth1_parent and parent_depth == 1
+            if parent not in seen and not parent_is_missing_depth1:
+                return False
+
+        seen.add(number)
+
+    return has_depth2 and has_depth3
+
+
+def detect_valid_mode(headings: list):
+    if not headings:
+        return None
+
+    if any(heading["kind"] == "case_like" for heading in headings):
+        return None
+
+    first = headings[0]
+
+    if first["kind"] == "arabic":
+        numbers = [heading["number"] for heading in headings if heading["kind"] == "arabic"]
+        if numbers and arabic_depth(numbers[0]) == 1:
+            if is_valid_arabic_hierarchy(numbers, allow_missing_depth1_parent=False):
+                return "A"
+        return None
+
+    if first["kind"] == "level1":
+        numbers = [heading["number"] for heading in headings[1:] if heading["kind"] == "arabic"]
+        if not numbers:
+            return None
+
+        first_depth = arabic_depth(numbers[0])
+        if first_depth == 2 and is_valid_arabic_hierarchy(numbers, allow_missing_depth1_parent=True):
+            return "B"
+
+        if first_depth == 1 and is_valid_arabic_hierarchy(numbers, allow_missing_depth1_parent=False):
+            return "C"
+
+    return None
+
+
+JsonContent = Any
+
+
+def reset_textlevel(json_content: JsonContent) -> JsonContent:
+    """
+    输入 JSON 内容，返回更新 text_level 后的新 JSON 内容。
+
+    json_content 可以是已经 json.load/json.loads 后的 Python 对象，
+    也可以是 JSON 字符串。函数不会修改原始入参。
+    """
+    if isinstance(json_content, str):
+        data = json.loads(json_content)
+    else:
+        data = copy.deepcopy(json_content)
+
+    if not isinstance(data, list):
+        return data
+
+    headings = collect_headings(data)
+    mode = detect_valid_mode(headings)
+
+    if mode is None:
+        return data
+
+    for item in data:
+        if not isinstance(item, dict):
+            continue
+        if item.get("type") != "text":
+            continue
+        if not has_valid_text_level(item):
+            continue
+
+        kind, number = parse_heading(item.get("text", ""))
+        if kind == "level1":
+            item["text_level"] = 1
+            continue
+        if kind != "arabic":
+            continue
+
+        depth = arabic_depth(number)
+        item["text_level"] = depth if mode in {"A", "B"} else depth + 1
+
+    return data
+
+
+
+
+
+if __name__ == "__main__":
+    json_file_path = r'E:\ZKYNLP\Hjunproject\project0506\kgrag\163-06A0014-B01001_发动机-维修手册_content_list.json'
+    with open(json_file_path, "r", encoding="utf-8") as f:
+        json_content = json.load(f)
+    result=  reset_textlevel(json_content)
+
+    for ins in result[:30]:
+        print(ins)
+    # print(json.dumps(result, ensure_ascii=False, indent=2))