diff --git a/src/character/chinese.py b/src/character/chinese.py
index b56f1ae..e7d843d 100755
--- a/src/character/chinese.py
+++ b/src/character/chinese.py
@@ -1,6 +1,14 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+from enum import Enum
+
+class Chinese:
+    OK = 'simplified'  # simplified chinese
+    WARN = 'traditional'  # traditional chinese
+    ERROR = 'unknown'  # unknown character
+
+
 def is_traditional(character: str) -> bool:  # whether character is traditional chinese
     character = character[0]
     try:
@@ -19,14 +27,29 @@ def is_simplified(character: str) -> bool:  # whether character is simplified ch
     return True
 
 
-def chinese_check(character: str) -> None:
+def chinese_check(character: str) -> Chinese:  # chinese character check
     character = character[0]
-    print(character)
-    print('is_simplified ->', is_simplified(character))
-    print('is_traditional ->', is_traditional(character))
-    print()
+    if is_simplified(character):  # simplified chinese case
+        return Chinese.OK
+    if is_traditional(character):  # traditional chinese case
+        return Chinese.WARN
+    return Chinese.ERROR  # unknown case
+
+
+def sentence_check(sentence: str) -> (bool, str):  # chinese sentence check
+    flag = False
+    characters = []
+    for character in sentence:
+        if chinese_check(character) == Chinese.OK:  # normal case
+            characters.append(character)
+        elif chinese_check(character) == Chinese.WARN:  # warning case
+            flag = True
+            characters.append('\033[0;33m%s\033[0;39m' % character)
+        else:
+            flag = True
+            characters.append('\033[0;31m%s\033[0;39m' % character)  # error case
+    return not flag, ''.join(characters)
 
 
-chinese_check('我')
-chinese_check('飯')
-chinese_check('们')
+print(sentence_check('我們今天去吃飯了►►►太好吃了'))
+print(sentence_check('测试成功OK'))