diff --git a/src/KeyWordExt.cpp b/src/KeyWordExt.cpp
index f8369b1..6499d11 100644
--- a/src/KeyWordExt.cpp
+++ b/src/KeyWordExt.cpp
@@ -14,10 +14,16 @@ namespace CppJieba
 
 	bool KeyWordExt::init(const char * const filePath)
 	{
-		return true;
+		return _segment.init(filePath);
 	}
 	
 	bool KeyWordExt::destroy()
+	{
+		_segment.destroy();
+		return true;
+	}
+
+	bool KeyWordExt::extract(const string& utf8Str)
 	{
 		return true;
 	}
diff --git a/src/KeyWordExt.h b/src/KeyWordExt.h
index 72b7eaa..b4fbde8 100644
--- a/src/KeyWordExt.h
+++ b/src/KeyWordExt.h
@@ -15,6 +15,9 @@ namespace CppJieba
 			bool init(const char * const filePath);
 			bool destroy();
 
+		public:
+			bool extract(const string& utf8Str);
+
 	};
 
 }