diff --git a/README.md b/README.md
index 8ae689e..8c8ecf2 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ n的jieba分词源码写的。
 
 #Detail
 ========
-1.现在只支持gbk编码的分词。
+1.现在支持utf8,gbk编码的分词。默认编码是utf8。
 2.分词算法上还没增加HMM模型这部分。
 3.关键词抽取是暂时是针对类似title之类的超短语句使用的，基本上没有普适性。
 
@@ -19,6 +19,7 @@ cd ./demo;
 make;
 ./segment_demo testlines.gbk
 ```
+run `./segment_demo` to get help.
 
 #Contact
 wuyanyi09@gmail.com
diff --git a/demo/keywordext_demo.cpp b/demo/keywordext_demo.cpp
index 648c1e2..f1600cc 100644
--- a/demo/keywordext_demo.cpp
+++ b/demo/keywordext_demo.cpp
@@ -73,25 +73,38 @@ void testKeyWordExt2(const char * dictPath, const char * filePath)
 	ext.dispose();
 }
 
-const char * const DEFAULT_DICTPATH = "../dicts/jieba.dict.gbk";
+const char * const DEFAULT_DICTPATH = "../dicts/jieba.dict.utf8";
 
 int main(int argc, char ** argv)
 {
-	ArgvContext arg(argc, argv);
-	string dictPath = arg["--dictpath"];
-	if("" == dictPath)
-	{
-		dictPath = DEFAULT_DICTPATH;
-	}
-	if("" == arg[1])
+	if(2 > argc)
 	{
 		cout<<"usage: \n\t"<<argv[0]<<" [options] <filename>\n"
 		    <<"options:\n"
 		    <<"\t--dictpath\tIf is not specified, the default is "<<DEFAULT_DICTPATH<<"\n"
-		    <<"\t--encoding\tSupported encoding methods are [gbk, utf-8] for now. \n\t\t\tIf is not specified, the default is gbk."
+		    <<"\t--encoding\tSupported encoding methods are [gbk, utf-8] for now. \n\t\t\tIf is not specified, the default is utf-8.\n"
+			<<"examples:\n"
+			<<"\t"<<argv[0]<<" testlines.utf8 --encoding utf-8 --dictpath ../dicts/jieba.dict.utf8\n"
+			<<"\t"<<argv[0]<<" testlines.gbk --encoding gbk --dictpath ../dicts/jieba.dict.gbk\n"
 			<<endl;
 		return -1;
 	}
+
+	ArgvContext arg(argc, argv);
+	string dictPath = arg["--dictpath"];
+	string encoding = arg["--encoding"];
+	if("" == dictPath)
+	{
+		dictPath = DEFAULT_DICTPATH;
+	}
+	if("gbk" == encoding)
+	{
+		TransCode::setGbkEnc();
+	}
+	else
+	{
+		TransCode::setUtf8Enc();
+	}
 	
 	testKeyWordExt(dictPath.c_str(), arg[1].c_str());
 	return 0;
diff --git a/demo/segment_demo.cpp b/demo/segment_demo.cpp
index e87bd3f..a81d9d6 100644
--- a/demo/segment_demo.cpp
+++ b/demo/segment_demo.cpp
@@ -47,23 +47,44 @@ bool dispose()
 	return true;
 }
 
+const char * const DEFAULT_DICTPATH = "../dicts/jieba.dict.utf8";
+
 int main(int argc, char ** argv)
 {
-	map<string, string> mpss;
+	/*map<string, string> mpss;
 	getArgvMap(argc, argv, mpss);
 	string enc = getMap<string, string>(mpss, "--encoding", "");
 	string dictPath = getMap<string, string>(mpss, "--dictpath", "../dicts/jieba.dict.gbk");
-	
+	*/
 	if(argc < 2)
 	{
 		cout<<"usage: \n\t"<<argv[0]<<" <filename> [options]\n"
 		    <<"options:\n"
-		    <<"\t--dictpath\tIf is not specified, the default is ../dicts/jieba.dict.gbk\n"
-		    <<"\t--encoding\tSupported encoding methods are [gbk, utf-8] for now. \n\t\t\tIf is not specified, the default is gbk."
+		    <<"\t--dictpath\tIf is not specified, the default is ../dicts/jieba.dict.utf8\n"
+		    <<"\t--encoding\tSupported encoding methods are [gbk, utf-8] for now. \n\t\t\tIf is not specified, the default is utf8.\n"
+			<<"example:\n"
+			<<"\t"<<argv[0]<<" testlines.utf8 --encoding utf-8 --dictpath ../dicts/jieba.dict.utf8\n"
+			<<"\t"<<argv[0]<<" testlines.gbk --encoding gbk --dictpath ../dicts/jieba.dict.gbk\n"
 			<<endl;
 		
 		return -1;
 	}
+	ArgvContext arg(argc, argv);
+	string dictPath = arg["--dictpath"];
+	string encoding = arg["--encoding"];
+	if("" == dictPath)
+	{
+		dictPath = DEFAULT_DICTPATH;
+	}
+	if("gbk" == encoding)
+	{
+		TransCode::setGbkEnc();
+	}
+	else
+	{
+		TransCode::setUtf8Enc();
+	}
+
 	init(dictPath.c_str());
 	run(argv[1]);
 	dispose();