diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9a6d5f9..00bb843 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,6 +4,7 @@ ADD_DEFINITIONS(-std=c++0x -O3)
 IF (DEFINED ENC)
     ADD_DEFINITIONS(-DCPPJIEBA_${ENC})
 ENDIF()
+#ADD_DEFINITIONS(-DNO_FILTER)
 ADD_SUBDIRECTORY(src)
 ADD_SUBDIRECTORY(dicts)
 ADD_SUBDIRECTORY(scripts)
diff --git a/src/SegmentBase.hpp b/src/SegmentBase.hpp
index 1e6168e..4fe73b2 100644
--- a/src/SegmentBase.hpp
+++ b/src/SegmentBase.hpp
@@ -31,13 +31,22 @@ namespace CppJieba
                     LogError("not inited.");
                     return false;
                 }
+                Unicode unico;
+#ifdef NO_FILTER
+                unico.clear();
+                if(!TransCode::decode(str, unico))
+                {
+                    LogFatal("str[%s] decode failed.", str.c_str());
+                    return false;
+                }
+                return cut(unico.begin(), unico.end(), res);
+#else
                 const char * const cstr = str.c_str();
                 uint size = str.size();
                 uint offset = 0;
                 string subs;
                 int ret;
                 uint len;
-                Unicode unico;
                 while(offset < size)
                 {
                     const char * const nstr = cstr + offset;
@@ -65,6 +74,7 @@ namespace CppJieba
                     offset += len;
                 }
                 return true;
+#endif
             }
 
     };