diff --git a/docs/check_doc_chars.py b/docs/check_doc_chars.py
index 127525da..7d34e4c6 100755
--- a/docs/check_doc_chars.py
+++ b/docs/check_doc_chars.py
@@ -16,24 +16,25 @@ def ESP_LOGI(x):
 def ESP_LOGE(x):
     print('\033[31m{}\033[0m'.format(x))
 
-# allowed characters, include some chinese characters, symbol, and punctuation
+# allowed characters, include some chinese characters, symbol, and punctuation in en document
 at_allowed_chars_list = ['中文', '®', '℃', '…', '✅', '❌', '√', '×', '├', '└', '│', '–', '—']
-at_not_allowed_chars_list = re.compile(b'[^\x0a\x0d\x20-\x7e]')
 at_file_white_list = ['index_of_abbreviations.rst']
+at_not_allowed_chars_list = re.compile(b'[^\x0a\x0d\x20-\x7e]')
 
-def at_get_file_list(doc_path, subdir_file_list):
-    if os.path.isdir(doc_path):
-        file_list = os.listdir(doc_path)
-    else:
-        subdir_file_list.append(doc_path)
-        return subdir_file_list
-    for file in file_list:
-        cur_path = os.path.join(doc_path, file)
-        if os.path.isdir(cur_path):
-            at_get_file_list(cur_path, subdir_file_list)
-        else:
-            subdir_file_list.append(cur_path)
-    return subdir_file_list
+# fullwidth space, letters, digits, punctuations that are not allowed in cn document
+at_fullwidth_space = r'　'
+at_fullwidth_letters = r'[Ａ-Ｚａ-ｚ]'
+at_fullwidth_digits = r'[０-９]'
+at_fullwidth_punctuations = r'[＠＃＄％＾＆＊－＋＝〈〉「」『』【】＼｜＇＂＜．＞／]'
+at_fullwidth_file_white_list = ['index_of_abbreviations.rst']
+
+def at_get_rst_list(path):
+    rst_files = []
+    for root, _, files in os.walk(path):
+        for file in files:
+            if file.endswith('.rst'):
+                rst_files.append(os.path.abspath(os.path.join(root, file)))
+    return rst_files
 
 def at_data_is_allowed_chars(match_info, data):
     to_check_idx = match_info.span()
@@ -57,33 +58,71 @@ def at_data_is_allowed_chars(match_info, data):
 
 def at_check_doc_chars_validity(doc_name):
     with open(doc_name, 'rb') as fp:
-        for (lineno, data) in enumerate(fp):
+        for (lineno, data) in enumerate(fp, start=1):
             match_info = re.search(at_not_allowed_chars_list, data)
             if match_info:
                 if not at_data_is_allowed_chars(match_info, data):
-                    ESP_LOGE('Error: illegal character detected at {}:{}'.format(doc_name, lineno + 1))
-                    print('raw data ----> {}\r\n'.format(data))
-                    print('Allowed chars:')
+                    ESP_LOGE('Error: illegal character detected at {}:{}'.format(doc_name, lineno))
+                    print(f'Line {lineno}: {data.strip()}')
+                    print('\r\nBut allowed chars:')
                     for x in at_allowed_chars_list:
                         print(x, '---->', x.encode())
                     return False
             pass
     return True
 
-def _main():
+def at_check_en_format():
     if len(sys.argv) == 2:
-        dst_path = os.path.abspath(sys.argv[1])
+        dst_path = os.path.abspath(sys.argv[1]) + '/en'
     else:
         dst_path = os.path.abspath('.') + '/en'
-    at_en_doc_file_list = at_get_file_list(dst_path, [])
+    at_en_doc_file_list = at_get_rst_list(dst_path)
     for current_file in at_en_doc_file_list:
         for file_basename in at_file_white_list:
             if os.path.basename(current_file) == file_basename:
                 continue
             else:
                 if at_check_doc_chars_validity(current_file) == False:
-                    sys.exit(-1)
-    ESP_LOGI('Document characters check passed! ({})'.format(dst_path))
+                    return False
+
+def at_check_fullwidth_chars(file_path):
+    pattern = re.compile(f'{at_fullwidth_space}|{at_fullwidth_letters}|{at_fullwidth_digits}|{at_fullwidth_punctuations}')
+    with open(file_path, 'r', encoding='utf-8') as file:
+        for line_number, line in enumerate(file, start=1):
+            matches = pattern.findall(line)
+            if matches:
+                ESP_LOGE('Error: illegal fullwidth character detected at {}:{}'.format(file_path, line_number))
+                print(f'Line {line_number}: {line.strip()}')
+                print(f"Full-width characters found: {', '.join(matches)}")
+                return False
+    return True
+
+def at_check_cn_format():
+    if len(sys.argv) == 2:
+        dst_path = os.path.abspath(sys.argv[1]) + '/zh_CN'
+    else:
+        dst_path = os.path.abspath('.') + '/zh_CN'
+    at_cn_doc_file_list = at_get_rst_list(dst_path)
+    for current_file in at_cn_doc_file_list:
+        if not at_fullwidth_file_white_list:
+            for file_basename in at_fullwidth_file_white_list:
+                if os.path.basename(current_file) == file_basename:
+                    continue
+                else:
+                    if at_check_fullwidth_chars(current_file) == False:
+                        return False
+        else:
+            if at_check_fullwidth_chars(current_file) == False:
+                return False
+
+def _main():
+    if at_check_en_format() == False:
+        sys.exit(-1)
+
+    if at_check_cn_format() == False:
+        sys.exit(-1)
+
+    ESP_LOGI('Document characters check passed!')
 
 if __name__ == '__main__':
     _main()