diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9ee5277..d71e7a0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -9,7 +9,7 @@ LINK_DIRECTORIES(Husky)
 
 INSTALL(TARGETS cjsegment RUNTIME DESTINATION bin)
 INSTALL(TARGETS cjserver RUNTIME DESTINATION bin)
-INSTALL(FILES ChineseFilter.hpp HMMSegment.hpp MPSegment.hpp structs.h Trie.hpp globals.h ISegment.hpp  MixSegment.hpp  SegmentBase.hpp  TransCode.hpp  DESTINATION include/CppJieba)
+INSTALL(FILES ChineseFilter.hpp HMMSegment.hpp MPSegment.hpp Trie.hpp globals.h ISegment.hpp  MixSegment.hpp  SegmentBase.hpp  TransCode.hpp  DESTINATION include/CppJieba)
 
 ADD_SUBDIRECTORY(Husky)
 ADD_SUBDIRECTORY(Limonp)
diff --git a/src/MPSegment.hpp b/src/MPSegment.hpp
index f8ce060..86f877e 100644
--- a/src/MPSegment.hpp
+++ b/src/MPSegment.hpp
@@ -16,6 +16,17 @@
 namespace CppJieba
 {
 
+    struct SegmentChar 
+    {
+        uint16_t uniCh;
+        DagType dag;
+        const TrieNodeInfo * pInfo;
+        double weight;
+        
+        SegmentChar(uint16_t uni):uniCh(uni), pInfo(NULL), weight(0.0)
+        {
+        }
+    };
     typedef vector<SegmentChar> SegmentContext;
 
     class MPSegment: public SegmentBase
diff --git a/src/Trie.hpp b/src/Trie.hpp
index 7d91112..b23bff3 100644
--- a/src/Trie.hpp
+++ b/src/Trie.hpp
@@ -16,7 +16,6 @@
 #include "Limonp/logger.hpp"
 #include "TransCode.hpp"
 #include "globals.h"
-#include "structs.h"
 
 
 namespace CppJieba
@@ -34,6 +33,30 @@ namespace CppJieba
         }
     };
 
+    struct TrieNodeInfo
+    {
+        Unicode word;
+        size_t freq;
+        string tag;
+        double logFreq; //logFreq = log(freq/sum(freq));
+        TrieNodeInfo():freq(0),logFreq(0.0)
+        {
+        }
+        TrieNodeInfo(const TrieNodeInfo& nodeInfo):word(nodeInfo.word), freq(nodeInfo.freq), tag(nodeInfo.tag), logFreq(nodeInfo.logFreq)
+        {
+        }
+        TrieNodeInfo(const Unicode& _word):word(_word),freq(0),logFreq(MIN_DOUBLE)
+        {
+        }
+		string toString()const
+		{
+            string tmp;
+            TransCode::encode(word, tmp);
+            return string_format("{word:%s,freq:%d, logFreq:%lf}", tmp.c_str(), freq, logFreq);
+		}
+    };
+    typedef unordered_map<uint, const TrieNodeInfo*> DagType;
+
     class Trie
     {
 
diff --git a/src/structs.h b/src/structs.h
deleted file mode 100644
index e02b294..0000000
--- a/src/structs.h
+++ /dev/null
@@ -1,111 +0,0 @@
-#ifndef CPPJIEBA_STRUCTS_H
-#define CPPJIEBA_STRUCTS_H
-
-#include <limits>
-#include "globals.h"
-#include "Trie.hpp"
-#include "TransCode.hpp"
-
-namespace CppJieba
-{
-
-    struct TrieNodeInfo
-    {
-        //string word;
-        //size_t wLen;// the word's len , not string.length(), 
-        Unicode word;
-        size_t freq;
-        string tag;
-        double logFreq; //logFreq = log(freq/sum(freq));
-        TrieNodeInfo():freq(0),logFreq(0.0)
-        {
-        }
-        TrieNodeInfo(const TrieNodeInfo& nodeInfo):word(nodeInfo.word), freq(nodeInfo.freq), tag(nodeInfo.tag), logFreq(nodeInfo.logFreq)
-        {
-        }
-        TrieNodeInfo(const Unicode& _word):word(_word),freq(0),logFreq(MIN_DOUBLE)
-        {
-        }
-		string toString()const
-		{
-            string tmp;
-            TransCode::encode(word, tmp);
-            return string_format("{word:%s,freq:%d, logFreq:%lf}", tmp.c_str(), freq, logFreq);
-		}
-    };
-
-    typedef unordered_map<uint, const TrieNodeInfo*> DagType;
-    struct SegmentChar 
-    {
-        uint16_t uniCh;
-        DagType dag;
-        const TrieNodeInfo * pInfo;
-        double weight;
-        
-        SegmentChar(uint16_t uni):uniCh(uni), pInfo(NULL), weight(0.0)
-        {
-        }
-        
-        /*const TrieNodeInfo* pInfo;
-        double weight;
-        SegmentChar(uint16_t unich, const TrieNodeInfo* p, double w):uniCh(unich), pInfo(p), weight(w)
-        {
-        }*/
-    };
-    /*
-    struct SegmentContext
-    {
-        vector<SegmentChar> context;
-        bool getDA
-    };*/
-    typedef vector<SegmentChar> SegmentContext;
-    
-
-    struct KeyWordInfo: public TrieNodeInfo
-    {
-        double idf;
-        double weight;// log(wLen+1)*logFreq;
-        KeyWordInfo():idf(0.0),weight(0.0)
-        {
-        }
-        KeyWordInfo(const Unicode& _word):TrieNodeInfo(_word),idf(0.0),weight(0.0)
-        { 
-        }
-        KeyWordInfo(const TrieNodeInfo& trieNodeInfo):TrieNodeInfo(trieNodeInfo)
-        {
-        }
-        string toString() const
-        {
-            string tmp;
-            TransCode::encode(word, tmp);
-            return string_format("{word:%s,weight:%lf, idf:%lf}", tmp.c_str(), weight, idf);
-        }
-        KeyWordInfo& operator = (const TrieNodeInfo& trieNodeInfo)
-        {
-            word = trieNodeInfo.word;
-            freq = trieNodeInfo.freq;
-            tag = trieNodeInfo.tag;
-            logFreq = trieNodeInfo.logFreq;
-            return *this;
-        }
-    };
-    
-    inline ostream& operator << (ostream& os, const KeyWordInfo& info)
-    {
-        string tmp;
-        TransCode::encode(info.word, tmp);
-        return os << "{words:" << tmp << ", weight:" << info.weight << ", idf:" << info.idf << "}";
-    }
-
-    //inline string joinWordInfos(const vector<KeyWordInfo>& vec)
-    //{
-    //    vector<string> tmp;
-    //    for(uint i = 0; i < vec.size(); i++)
-    //    {
-    //        tmp.push_back(vec[i].toString());
-    //    }
-    //    return joinStr(tmp, ",");
-    //}
-}
-
-#endif