diff --git a/docs/doc/convention/app.md b/docs/doc/convention/app.md
index 67013c3e..60f1a22d 100644
--- a/docs/doc/convention/app.md
+++ b/docs/doc/convention/app.md
@@ -89,7 +89,7 @@ exclude:       # not support regular expression, .git and __pycache__ is always
 * All shared data is stored in `/maixapp/share`.
 * All pictures are stored in `/maixapp/share/picture`.
 * All video files are stored in `/maixapp/share/video`.
-* Temporary data can be stored in `/maixapp/tmp`.
+* Temporary data can be stored in `/maixapp/tmp`. Note that this directory is located on the file system (SD card), which differs from the system's `/tmp` directory. The `/tmp` directory on the system is a virtual file system in memory, offering faster read/write speeds but with limited memory size. Large files and log files that need to be stored long-term (which may grow over time) are recommended to be placed in the `/maixapp/tmp` directory.
 * Font files are stored in `/maixapp/share/font`.
 * Icon files are stored in `/maixapp/share/icon`.
 * APP's data files created at runtime can be stored in `/maixapp/apps/app_id/data`.
diff --git a/docs/doc_zh/convention/app.md b/docs/doc_zh/convention/app.md
index 46bff8c8..4c2ac108 100644
--- a/docs/doc_zh/convention/app.md
+++ b/docs/doc_zh/convention/app.md
@@ -86,7 +86,7 @@ exclude:       # 不支持正则表达式，.git 和 __pycache__ 总是会被排
 * 共享数据存储在 `/maixapp/share`。
 * 图片文件存储在 `/maixapp/share/picture`。
 * 视频文件存储在 `/maixapp/share/video`。
-* 临时数据可以存储在 `/maixapp/tmp`。
+* 临时数据可以存储在 `/maixapp/tmp`，注意，和 Linux 本身的`/tmp` 目录不同的是这个目录是在文件系统（SD卡）上的，系统`/tmp`是在内存上虚拟的文件系统，`/tmp`读写速度更快但是内存大小受限，大文件以及需要长期记录的日志文件（随着时间推移可能变得比较大）建议放在`/maixapp/tmp`目录下。
 * 字体文件存储在 `/maixapp/share/font`。
 * 图标文件存储在 `/maixapp/share/icon`。
 * 应用运行时创建的数据文件可以存储在 `/maixapp/apps/app_id/data`。
diff --git a/tools/doc_tool/gen_markdown.py b/tools/doc_tool/gen_markdown.py
index 5590cdf5..96d11f94 100644
--- a/tools/doc_tool/gen_markdown.py
+++ b/tools/doc_tool/gen_markdown.py
@@ -289,8 +289,25 @@ def gen_md_doc_from_comment(doc_comment):
             content += _content
         return content
 
+    ids = {
+        # "module": {
+        #     "id": "Module",
+        #     "count": 1
+        # },
+    }
+    def update_id(h_str, id) -> str:
+        l_id = id.lower()
+        if l_id not in ids:
+            ids[l_id] = {
+                "id": id,
+                "count": 1
+            }
+            return f'{h_str} {id} {{#{id}}}'
+        ids[l_id]["count"] += 1
+        return f'{h_str} {id} {{#{id}-{ids[l_id]["count"]}}}'
+
     # Module
-    content += "## Module\n\n"
+    content += update_id("##", "Module") + "\n\n"
     _content = ""
     for key, item in module["members"].items():
         if item["type"] != "module":
@@ -305,11 +322,11 @@ def gen_md_doc_from_comment(doc_comment):
     content += "\n\n"
 
     # Enum
-    content += "## Enum\n\n"
+    content += update_id("##", "Enum") + "\n\n"
     for key, item in module["members"].items():
         if item["type"] != "enum":
             continue
-        content += '### {}\n\n'.format(key.replace("_", "\_"))
+        content += update_id("###", key.replace("_", "\_")) + "\n\n"
         content += item["doc"].get("brief", "") + "\n\n"
         content += '| item | describe |\n'
         content += '| --- | --- |\n'
@@ -321,11 +338,11 @@ def gen_md_doc_from_comment(doc_comment):
     content += "\n\n"
 
     # Variable
-    content += "## Variable\n\n"
+    content += update_id("##", "Variable") + "\n\n"
     for key, item in module["members"].items():
         if item["type"] != "var":
             continue
-        content += '### {}\n\n'.format(key.replace("_", "\_"))
+        content += update_id("###", key.replace("_", "\_")) + "\n\n"
         content += item["doc"].get("brief", "") + "\n\n"
         content += '| item | description |\n'
         content += '| --- | --- |\n'
@@ -336,11 +353,11 @@ def gen_md_doc_from_comment(doc_comment):
     content += "\n\n"
 
     # Function
-    content += "## Function\n\n"
+    content += update_id("##", "Function") + "\n\n"
     def gen_func_info(key, item, overload_count = -1):
         if overload_count >= 0:
             key = "{} (overload {})".format(key, overload_count + 1)
-        content = '### {}\n\n'.format(key.replace("_", "\_"))
+        content = update_id('###', key.replace("_", "\_")) + "\n\n"
         if "py_def" in item:
             content += f'```python\n{item["py_def"]}\n```\n'
         content += item["doc"].get("brief", "") + "\n\n"
@@ -361,11 +378,11 @@ def gen_func_info(key, item, overload_count = -1):
     content += "\n\n"
 
     # Class
-    content += "## Class\n\n"
+    content += update_id("##", "Class") + "\n\n"
     for key, item in module["members"].items():
         if item["type"] != "class":
             continue
-        content += '### {}\n\n'.format(key.replace("_", "\_"))
+        content += update_id('###', key.replace("_", "\_")) + "\n\n"
         content += item["doc"].get("brief", "") + "\n\n"
         if have_doc_kv(item["doc"]):
             content += '| item | description |\n'
@@ -379,7 +396,7 @@ def gen_class_func_info(key, item, overload_count = -1):
                 raise Exception("class member only support {} now, but got {}".format(supported_types, item["type"]))
             if overload_count >= 0:
                 key = "{} (overload {})".format(key, overload_count + 1)
-            content = '#### {}\n\n'.format(key.replace("_", "\_"))
+            content = update_id('####', key.replace("_", "\_")) + "\n\n"
             if "py_def" in item:
                 content += f'```python\n{item["py_def"]}\n```\n'
             content += item["doc"].get("brief", "") + "\n\n"