diff --git a/inc/hgl/type/ConstStringSet.h b/inc/hgl/type/ConstStringSet.h
new file mode 100644
index 0000000..701f295
--- /dev/null
+++ b/inc/hgl/type/ConstStringSet.h
@@ -0,0 +1,194 @@
+#pragma once
+
+#include<hgl/type/SortedSets.h>
+#include<hgl/type/Map.h>
+#include<hgl/io/TextOutputStream.h>
+
+namespace hgl
+{
+    template<typename SC> class ConstString
+    {
+        const SC *str;
+        int length;
+
+    public:
+
+        ConstString(const SC *s,int l)
+        {
+            str=s;
+            length=l;
+        }
+
+        const SC *c_str()const{return str;}
+
+        const SC *GetString()const{return str;}
+        const int GetLength()const{return length;}
+
+        const int Comp(const ConstString &cs)const
+        {
+            if(length<cs.length)return(-1);
+            if(length>cs.length)return( 1);
+
+            return memcmp(str,cs.str,length);
+        }
+
+        CompOperator(const ConstString &,Comp)
+    };
+
+    template<typename SC> struct ConstStringView
+    {
+        DataArray<SC> *str_data;
+
+        int id;             ///<顺序号
+        int length;         ///<字符串长度
+
+        union
+        {
+            size_t offset;      ///<字符串在整个数据中的偏移(id>=0插入合集时使用)
+            const SC *str;      ///<字符串指针(id为-1,未插入合集时使用)
+        };
+
+    public:
+
+        const SC *GetString()const
+        {
+            if(id==-1)
+                return str;
+            else
+                return str_data->GetData()+offset;
+        }
+
+        int Comp(const ConstStringView<SC> &csv)const
+        {
+            if(length!=csv.length)return(length-csv.length);
+
+            return hgl::strcmp(GetString(),csv.GetString(),length);
+        }
+
+        CompOperator(const ConstStringView &,Comp)
+    };
+
+    template<typename SC> class ConstStringSet
+    {
+    private:
+
+        DataArray<SC> str_data;                                 ///<字符串数据
+
+        SortedSets<ConstStringView<SC>> str_set;                ///<字符串集合
+
+        List<ConstStringView<SC>> str_list;                     ///<字符串列表
+        Map<int,size_t> str_offset_map;                         ///<字符串映射
+
+    public:
+
+        const int GetCount      ()const{return str_list.GetCount();}                                    ///<取得字符串数量
+        const int GetTotalLength()const{return str_data.GetCount();}                                    ///<取得字符串总长度
+        const int GetTotalBytes ()const{return str_data.GetCount()*sizeof(SC);}                         ///<取得字符串总字节数
+
+        const DataArray<SC> &GetStringData()const{return str_data;}                                     ///<取得字符串数据
+
+        const List<ConstStringView<SC>> &GetConstStringList()const{return str_list;}                    ///<取得字符串列表
+
+    public:
+
+        const bool IsMember(const SC *str,int length)const                          ///<判断字符串是否为合集成员
+        {
+            if(!str||!*str||length<=0)return(-1);
+
+            ConstStringView<SC> csv;
+
+            csv.length=length;
+            csv.str=str;
+
+            return(str_set.FindPos(csv)!=-1);
+        }
+
+        const int GetID(const SC *str,int length)const                              ///<取得字符串ID
+        {
+            if(!str||!*str||length<=0)return(-1);
+
+            ConstStringView<SC> csv;
+
+            csv.id      =-1;
+            csv.length  =length;
+            csv.str     =str;
+
+            int64 index=str_set.Find(csv);
+            if(index>=0)
+            {
+                str_set.Get(index,csv);
+                return csv.id;
+            }
+
+            return -1;
+        }
+
+        const SC *GetString(const int id)const                                      ///<根据ID取得字符串
+        {
+            if(id<0||id>=count)return(nullptr);
+            
+            size_t offset;
+
+            if(str_offset_map.Get(id,offset))
+                return str_data.GetData()+offset;
+            else
+                return nullptr;
+        }
+
+        const ConstStringView<SC> *GetStringView(const int id)const                  ///<根据ID取得字符串视图
+        {
+            return str_list.GetPointer(id);
+        }
+
+    public:
+
+        ConstStringSet(){}
+
+        virtual ~ConstStringSet()=default;
+
+        int AddString(ConstStringView<SC> &csv,const SC *str,int length)            ///<添加一个字符串
+        {
+            if(!str||!*str||length<=0)
+                return(-1);
+
+            csv.id=GetID(str,length);
+
+            if(csv.id>=0)
+                return csv.id;
+
+            csv.str_data=&str_data;
+            csv.id      =str_set.GetCount();
+            csv.length  =length;
+            csv.offset  =str_data.GetCount();
+
+            {
+                str_data.AddCount(length+1);
+            
+                SC *save_str=str_data.GetData()+csv.offset;
+
+                hgl_cpy<SC>(save_str,str,length);
+
+                save_str[length]=0;
+            }
+
+            str_set.Add(csv);
+
+            str_list.Add(csv);
+            str_offset_map.Add(csv.id,csv.offset);
+
+            return csv.id;
+        }
+    };//class ConstStringSet
+
+    using ConstAnsiStringSet    =ConstStringSet<char>;
+    using ConstWideStringSet    =ConstStringSet<wchar_t>;
+    using ConstUTF8StringSet    =ConstStringSet<u8char>;
+    using ConstUTF16StringSet   =ConstStringSet<u16char>;
+//    using ConstUTF32StringSet   =ConstStringSet<u32char>;
+    using ConstOSStringSet      =ConstStringSet<os_char>;
+
+    template<typename SC> bool SaveToTextStream(hgl::io::TextOutputStream *tos,const ConstStringSet<SC> *css,bool output_id=false);
+    template<typename SC> bool SaveToTextFile(const OSString &filename,const ConstStringSet<SC> *css,bool output_id=false,bool output_bom=true);
+
+    //template<typename SC> bool SaveToDataStream(hgl::io::DataOutputStream *dos,const ConstStringSet<SC> *css);
+}//namespace hgl
diff --git a/inc/hgl/type/List.h b/inc/hgl/type/List.h
index e429574..0085e25 100644
--- a/inc/hgl/type/List.h
+++ b/inc/hgl/type/List.h
@@ -202,7 +202,7 @@ namespace hgl
         virtual bool GetLast    (T &data)const{return data_array.ReadAt(data,GetCount()-1);}        ///<取最后一个数据
     };//template <typename T> class List
 
-    template<typename T> T *GetListObject(const List<T *> &list,const int index)
+    template<typename T> T *GetObjectFromList(const List<T *> &list,const int index)
     {
         T *obj;
 
diff --git a/inc/hgl/type/Map.cpp b/inc/hgl/type/Map.cpp
index 9ce953a..23e5acf 100644
--- a/inc/hgl/type/Map.cpp
+++ b/inc/hgl/type/Map.cpp
@@ -192,7 +192,7 @@ namespace hgl
         if(index==-1)
             return(nullptr);
 
-        KVData *obj=GetListObject(data_list,index);
+        KVData *obj=GetObjectFromList(data_list,index);
 
         if(!obj)return(nullptr);
         return &(obj->value);
@@ -209,7 +209,7 @@ namespace hgl
     {
         int index=Find(flag);
 
-        KVData *obj=GetListObject(data_list,index);
+        KVData *obj=GetObjectFromList(data_list,index);
 
         if(!obj)
             return(-1);
@@ -224,7 +224,7 @@ namespace hgl
     {
         int index=Find(key);
 
-        KVData *obj=GetListObject(data_list,index);
+        KVData *obj=GetObjectFromList(data_list,index);
 
         if(!obj)
             return(false);
@@ -323,7 +323,7 @@ namespace hgl
     {
         int index=Find(flag);
 
-        KVData *dp=GetListObject(data_list,index);
+        KVData *dp=GetObjectFromList(data_list,index);
 
         if(!dp)
             return(false);
@@ -394,7 +394,7 @@ namespace hgl
         if(index<0
          ||index>=data_list.GetCount())return(false);
 
-        data_pool.Release(GetListObject(data_list,index));
+        data_pool.Release(GetObjectFromList(data_list,index));
         data_list.DeleteMove(index);
 
         return(true);
@@ -433,7 +433,7 @@ namespace hgl
 
         if(FindPos(flag,result))
         {
-            dp=GetListObject(data_list,result);
+            dp=GetObjectFromList(data_list,result);
 
             if(dp)
             {
@@ -469,7 +469,7 @@ namespace hgl
     template<typename K,typename V,typename KVData>
     bool _Map<K,V,KVData>::Change(const K &flag,const V &data)
     {
-        KVData *dp=GetListObject(data_list,Find(flag));
+        KVData *dp=GetObjectFromList(data_list,Find(flag));
 
         if(!dp)
             return(false);
diff --git a/inc/hgl/type/Map.h b/inc/hgl/type/Map.h
index 9792bbc..aecc9a0 100644
--- a/inc/hgl/type/Map.h
+++ b/inc/hgl/type/Map.h
@@ -125,7 +125,7 @@ namespace hgl
                     return count;
                 }
 
-                KVData *GetItem(int n){return GetListObject(data_list,n);}                          ///<取指定序号的数据
+                KVData *GetItem(int n){return GetObjectFromList(data_list,n);}                          ///<取指定序号的数据
                 bool    GetBySerial(int,K &,V &) const;                                             ///<取指定序号的数据
                 bool    GetKey(int,K &);                                                            ///<取指定序号的索引
                 bool    GetValue(int,V &);                                                          ///<取指定序号的数据
@@ -151,7 +151,7 @@ namespace hgl
         virtual ~Map()=default;
     };//class Map
 
-    template<typename T_ID,typename T_U> T_U *GetListObject(Map<T_ID,T_U *> &list,const T_ID &id)
+    template<typename T_ID,typename T_U> T_U *GetObjectFromList(Map<T_ID,T_U *> &list,const T_ID &id)
     {
         T_U *result;
 
@@ -180,7 +180,7 @@ namespace hgl
 
                 void    DeleteObject(int index)
                 {
-                    DeleteObject(GetListObject(this->data_list,index));
+                    DeleteObject(GetObjectFromList(this->data_list,index));
                 }
 
     public:
@@ -301,7 +301,7 @@ namespace hgl
             {
                 DeleteObject(index);
 
-                KVData *dp=GetListObject(this->data_list,index);
+                KVData *dp=GetObjectFromList(this->data_list,index);
 
                 if(dp)
                     dp->value=data;
@@ -326,7 +326,7 @@ namespace hgl
             {
                 DeleteObject(index);
 
-                KVData *dp=GetListObject(this->data_list,index);
+                KVData *dp=GetObjectFromList(this->data_list,index);
 
                 if(!dp)
                     return(false);
@@ -342,7 +342,7 @@ namespace hgl
 
         V *operator[](const K &index)const
         {
-            auto *obj=GetListObject(this->data_list,this->Find(index));
+            auto *obj=GetObjectFromList(this->data_list,this->Find(index));
 
             if(obj)
                 return obj->value;
diff --git a/inc/hgl/type/SortedSets.h b/inc/hgl/type/SortedSets.h
index f0f779a..ea2d68d 100644
--- a/inc/hgl/type/SortedSets.h
+++ b/inc/hgl/type/SortedSets.h
@@ -156,7 +156,7 @@ namespace hgl
         void    Free            (){data_list.Free();}                                       ///<清除数据，并释放内存
         void    Clear           (){data_list.Clear();}                                      ///<清除数据，但不释放内存
 
-        bool    Get             (const int64 index,T &data)                                 ///<根据序列号取得指定数据
+        bool    Get             (const int64 index,T &data) const                           ///<根据序列号取得指定数据
         {
             if(index<0||index>=data_list.GetCount())
                 return(false);
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 31487fb..9aa32b5 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -73,7 +73,9 @@ SET(STRING_HEADER_FILES ${TYPE_INCLUDE_PATH}/String.h
                         ${TYPE_INCLUDE_PATH}/StringList.h
                         ${TYPE_INCLUDE_PATH}/SplitString.h
                         ${TYPE_INCLUDE_PATH}/MergeString.h
-                        ${TYPE_INCLUDE_PATH}/StdString.h)
+                        ${TYPE_INCLUDE_PATH}/StdString.h
+                        ${TYPE_INCLUDE_PATH}/ConstStringSet.h
+)
 
 SET(TEXT_HEADER_FILES   ${CMCORE_ROOT_INCLUDE_PATH}/hgl/Endian.h
                         ${CMCORE_ROOT_INCLUDE_PATH}/hgl/CodePage.h
@@ -83,7 +85,8 @@ SET(TEXT_HEADER_FILES   ${CMCORE_ROOT_INCLUDE_PATH}/hgl/Endian.h
 
 SET(TEXT_SOURCE_FILES   Text/Endian.cpp
                         Text/CodePage.cpp
-                        Text/UnicodeBlocks.cpp)
+                        Text/UnicodeBlocks.cpp
+                        Text/ConstStringSetSaveToTextStream.cpp)
 
 SOURCE_GROUP("Text\\String" FILES   ${STRING_HEADER_FILES}
                                     Text/StringList.cpp)
diff --git a/src/Text/ConstStringSetSaveToTextStream.cpp b/src/Text/ConstStringSetSaveToTextStream.cpp
new file mode 100644
index 0000000..ae8b9aa
--- /dev/null
+++ b/src/Text/ConstStringSetSaveToTextStream.cpp
@@ -0,0 +1,90 @@
+#include<hgl/type/ConstStringSet.h>
+#include<hgl/io/TextOutputStream.h>
+#include<hgl/io/FileOutputStream.h>
+
+namespace hgl
+{
+    template<typename SC> bool SaveToTextStream(io::TextOutputStream *tos,const ConstStringSet<SC> *css,bool output_id)
+    {
+        if(!tos||!css)
+            return(false);
+
+        if(css->GetCount()<=0)
+            return(true);
+
+        if(output_id)
+        {
+            SC id_str[16];
+            const SC gap_str[4]={SC(' '),SC(':'),SC(' '),0};
+
+            const List<ConstStringView<SC>> &csv_list=css->GetConstStringList();
+
+            for(auto &csv:csv_list)
+            {
+                utos<SC>(id_str,sizeof(id_str),csv.id);
+
+                tos->WriteChars(id_str,hgl::strlen(id_str));
+                tos->WriteChars(gap_str,3);
+                tos->WriteChars(csv.GetString(),csv.length);
+                tos->WriteLineEnd();
+            }
+
+            return(true);
+        }
+        else
+        {
+            const DataArray<SC> &data_array=css->GetStringData();
+
+            int length=data_array.GetCount();
+
+            AutoDeleteArray<SC> text(length);
+
+            hgl_cpy<SC>(text,data_array.data(),length);
+
+            for(int i=0;i<length;i++)
+            {
+                if(text[i]==0)
+                    text[i]=SC('\n');
+            }
+
+            tos->WriteChars(text,length);
+            return(true);
+        }
+    }
+
+    template<typename SC> bool SaveToTextFile(const OSString &filename,const ConstStringSet<SC> *css,bool output_id,bool output_bom)
+    {
+        if(!css)
+            return(false);
+
+        if(filename.IsEmpty())
+            return(false);
+
+        if(css->GetCount()<=0)
+            return(true);
+
+        io::OpenFileOutputStream fos(filename,io::FileOpenMode::CreateTrunc);
+
+        if(!fos)
+            return(false);
+
+        AutoDelete<io::TextOutputStream> tos=io::CreateTextOutputStream<SC>(&fos);
+
+        if(output_bom)
+            tos->WriteBOM();
+
+        return SaveToTextStream<SC>(tos,css,output_id);
+    }
+
+    //下面这些定义是为了实例化上面的函数，所以不要删掉
+
+    bool SaveToAnsiTextStream(hgl::io::TextOutputStream *tos,const ConstAnsiStringSet *css,bool output_id){return SaveToTextStream(tos,css,output_id);}
+    bool SaveToWideTextStream(hgl::io::TextOutputStream *tos,const ConstWideStringSet *css,bool output_id){return SaveToTextStream(tos,css,output_id);}
+    bool SaveToUTF8TextStream(hgl::io::TextOutputStream *tos,const ConstUTF8StringSet *css,bool output_id){return SaveToTextStream(tos,css,output_id);}
+    bool SaveToUTF16TextStream(hgl::io::TextOutputStream *tos,const ConstUTF16StringSet *css,bool output_id){return SaveToTextStream(tos,css,output_id);}
+
+    bool SaveToAnsiTextFile(const OSString &filename,const ConstAnsiStringSet *css,bool output_id,bool output_bom){return SaveToTextFile(filename,css,output_id,output_bom);}
+    bool SaveToWideTextFile(const OSString &filename,const ConstWideStringSet *css,bool output_id,bool output_bom){return SaveToTextFile(filename,css,output_id,output_bom);}
+    bool SaveToUTF8TextFile(const OSString &filename,const ConstUTF8StringSet *css,bool output_id,bool output_bom){return SaveToTextFile(filename,css,output_id,output_bom);}
+    bool SaveToUTF16TextFile(const OSString &filename,const ConstUTF16StringSet *css,bool output_id,bool output_bom){return SaveToTextFile(filename,css,output_id,output_bom);}
+}//namespace hgl