diff --git a/ChangeLog.md b/ChangeLog.md
index f5203a7..79f1902 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # CppJieba ChangeLog
 
+## next version
+
+1. 在 class Jieba 中新增词性标注的接口函数 Jieba::Tag
+
 ## v4.1.0
 
 1. QuerySegment切词时加一层判断，当长词满足IsAllAscii(比如英文单词)时，不进行细粒度分词。
diff --git a/README.md b/README.md
index 85688b5..46cc22f 100644
--- a/README.md
+++ b/README.md
@@ -295,7 +295,7 @@ Query方法先使用Mix方法切词，对于切出来的较长的词再使用Ful
 
 ```
 我是蓝翔技工拖拉机学院手扶拖拉机专业的。不用多久，我就会升职加薪，当上总经理，出任CEO，迎娶白富美，走上人生巅峰。
-["我:r", "是:v", "蓝翔:x", "技工:n", "拖拉机:n", "学院:n", "手扶拖拉机:n", "专业:n", "的:uj", "。:x", "不用:v", "多久:m", "，:x", "我:r", "就:d", "会:v", "升职:v", "加薪:nr", "，:x", "当:t", "上:f", "总经理:n", "，:x", "出任:v", "CEO:eng", "，:x", "迎娶:v", "白富美:x", "，:x", "走上:v", "人生:n", "巅峰:n", "。:x"]
+["我:r", "是:v", "拖拉机:n", "学院:n", "手扶拖拉机:n", "专业:n", "的:uj", "。:x", "不用:v", "多久:m", "，:x", "我:r", "就:d", "会:v", "升职:v", "加薪:nr", "，:x", "当上:t", "CEO:eng", "，:x", "走上:v", "人生:n", "巅峰:n", "。:x"]
 ```
 
 详细请看 `test/demo.cpp`.
diff --git a/src/Jieba.hpp b/src/Jieba.hpp
index 329e3f3..a758a97 100644
--- a/src/Jieba.hpp
+++ b/src/Jieba.hpp
@@ -17,7 +17,8 @@ class Jieba {
       mix_seg_(&dict_trie_, &model_),
       full_seg_(&dict_trie_),
       query_seg_(&dict_trie_, &model_),
-      level_seg_(&dict_trie_) {
+      level_seg_(&dict_trie_),
+      pos_tagger_(&dict_trie_, &model_) {
   }
   ~Jieba() {
   }
@@ -43,6 +44,9 @@ class Jieba {
   void CutSmall(const string& sentence, vector<string>& words, size_t max_word_len) const {
     mp_seg_.Cut(sentence, words, max_word_len);
   }
+  void Tag(const string& sentence, vector<pair<string, string> >& words) const {
+    pos_tagger_.Tag(sentence, words);
+  }
   bool InsertUserWord(const string& word, const string& tag = UNKNOWN_TAG) {
     return dict_trie_.InsertUserWord(word, tag);
   }
@@ -69,6 +73,8 @@ class Jieba {
   QuerySegment query_seg_;
   LevelSegment level_seg_;
   
+  PosTagger pos_tagger_;
+  
 }; // class Jieba
 
 } // namespace Jieba
diff --git a/test/demo.cpp b/test/demo.cpp
index a964b19..f697b1c 100644
--- a/test/demo.cpp
+++ b/test/demo.cpp
@@ -33,11 +33,11 @@ int main(int argc, char** argv) {
   jieba.Cut("男默女泪", words);
   cout << limonp::join(words.begin(), words.end(), "/") << endl;
 
-  //cout << "[demo] TAGGING" << endl;
-  //vector<pair<string, string> > tagres;
-  //jieba.Tag(s, tagres);
-  //cout << s << endl;
-  //cout << tagres << endl;;
+  cout << "[demo] TAGGING" << endl;
+  vector<pair<string, string> > tagres;
+  jieba.Tag(s, tagres);
+  cout << s << endl;
+  cout << tagres << endl;;
 
   //cout << "[demo] KEYWORD" << endl;
   //vector<pair<string, double> > keywordres;