diff --git a/include/cppjieba/DictTrie.hpp b/include/cppjieba/DictTrie.hpp
index 1e22ecc..aaefb04 100644
--- a/include/cppjieba/DictTrie.hpp
+++ b/include/cppjieba/DictTrie.hpp
@@ -50,6 +50,17 @@ class DictTrie {
     return true;
   }
 
+  bool InsertUserWord(const string& word,int freq, const string& tag = UNKNOWN_TAG) {
+    DictUnit node_info;
+    double weight = freq ? log(1.0 * freq / freq_sum_) : user_word_default_weight_ ;
+    if (!MakeNodeInfo(node_info, word, weight , tag)) {
+      return false;
+    }
+    active_node_infos_.push_back(node_info);
+    trie_->InsertNode(node_info.word, &active_node_infos_.back());
+    return true;
+  }
+
   const DictUnit* Find(RuneStrArray::const_iterator begin, RuneStrArray::const_iterator end) const {
     return trie_->Find(begin, end);
   }
@@ -69,6 +80,30 @@ class DictTrie {
     return min_weight_;
   }
 
+  void InserUserDictNode(vector<string>& buf){
+    DictUnit node_info;
+    if(buf.size() == 1){
+          MakeNodeInfo(node_info, 
+                buf[0], 
+                user_word_default_weight_,
+                UNKNOWN_TAG);
+        } else if (buf.size() == 2) {
+          MakeNodeInfo(node_info, 
+                buf[0], 
+                user_word_default_weight_,
+                buf[1]);
+        } else if (buf.size() == 3) {
+          int freq = atoi(buf[1].c_str());
+          assert(freq_sum_ > 0.0);
+          double weight = log(1.0 * freq / freq_sum_);
+          MakeNodeInfo(node_info, buf[0], weight, buf[2]);
+        }
+        static_node_infos_.push_back(node_info);
+        if (node_info.word.size() == 1) {
+          user_dict_single_chinese_word_.insert(node_info.word[0]);
+        }
+  }
+
  private:
   void Init(const string& dict_path, const string& user_dict_paths, UserWordWeightOption user_word_weight_opt) {
     LoadDict(dict_path);
@@ -95,6 +130,8 @@ class DictTrie {
     trie_ = new Trie(words, valuePointers);
   }
 
+  
+
   void LoadUserDict(const string& filePaths) {
     vector<string> files = limonp::Split(filePaths, "|;");
     size_t lineno = 0;
@@ -102,7 +139,6 @@ class DictTrie {
       ifstream ifs(files[i].c_str());
       XCHECK(ifs.is_open()) << "open " << files[i] << " failed"; 
       string line;
-      DictUnit node_info;
       vector<string> buf;
       for (; getline(ifs, line); lineno++) {
         if (line.size() == 0) {
@@ -110,27 +146,7 @@ class DictTrie {
         }
         buf.clear();
         Split(line, buf, " ");
-        DictUnit node_info;
-        if(buf.size() == 1){
-          MakeNodeInfo(node_info, 
-                buf[0], 
-                user_word_default_weight_,
-                UNKNOWN_TAG);
-        } else if (buf.size() == 2) {
-          MakeNodeInfo(node_info, 
-                buf[0], 
-                user_word_default_weight_,
-                buf[1]);
-        } else if (buf.size() == 3) {
-          int freq = atoi(buf[1].c_str());
-          assert(freq_sum_ > 0.0);
-          double weight = log(1.0 * freq / freq_sum_);
-          MakeNodeInfo(node_info, buf[0], weight, buf[2]);
-        }
-        static_node_infos_.push_back(node_info);
-        if (node_info.word.size() == 1) {
-          user_dict_single_chinese_word_.insert(node_info.word[0]);
-        }
+        InserUserDictNode(buf);
       }
     }
   }