diff --git a/src/PosTagger.hpp b/src/PosTagger.hpp
index 63f13c0..b63f1de 100644
--- a/src/PosTagger.hpp
+++ b/src/PosTagger.hpp
@@ -17,13 +17,16 @@ namespace CppJieba
 
         public:
             PosTagger(){};
-            PosTagger(const string& dictPath, const string& hmmFilePath, const string& charStatus, const string& startProb, const string& emitProb, const string& endProb, const string& transProb)
+            PosTagger(
+                const string& dictPath, 
+                const string& hmmFilePath
+            )
             {
-                LIMONP_CHECK(init(dictPath, hmmFilePath, charStatus, startProb, emitProb, endProb, transProb));
+                LIMONP_CHECK(init(dictPath, hmmFilePath));
             };
             ~PosTagger(){};
         public:
-            bool init(const string& dictPath, const string& hmmFilePath, const string& charStatus, const string& startProb, const string& emitProb, const string& endProb, const string& transProb)
+            bool init(const string& dictPath, const string& hmmFilePath)
             {
                 LIMONP_CHECK(_dictTrie.init(dictPath));
                 LIMONP_CHECK(_segment.init(dictPath, hmmFilePath));
diff --git a/test/tagging_demo.cpp b/test/tagging_demo.cpp
index 5b341f9..638352a 100644
--- a/test/tagging_demo.cpp
+++ b/test/tagging_demo.cpp
@@ -3,7 +3,7 @@ using namespace CppJieba;
 
 int main(int argc, char ** argv)
 {
-    PosTagger tagger("../dict/jieba.dict.utf8", "../dict/hmm_model.utf8", "", "", "", "", "");
+    PosTagger tagger("../dict/jieba.dict.utf8", "../dict/hmm_model.utf8");
     string s("我是蓝翔技工拖拉机学院手扶拖拉机专业的。不用多久，我就会升职加薪，当上总经理，出任CEO，迎娶白富美，走上人生巅峰。");
     vector<pair<string, string> > res;
     tagger.tag(s, res);
diff --git a/test/unittest/CMakeLists.txt b/test/unittest/CMakeLists.txt
index c252213..a6c8de4 100644
--- a/test/unittest/CMakeLists.txt
+++ b/test/unittest/CMakeLists.txt
@@ -16,7 +16,13 @@ ADD_LIBRARY(gtest STATIC ${GTEST_ROOT_DIR}/src/gtest-all.cc)
 #ADD_EXECUTABLE(keyword.test gtest_main.cpp TKeywordExtractor.cpp)
 #TARGET_LINK_LIBRARIES(keyword.test gtest pthread)
 
-ADD_EXECUTABLE(test.run gtest_main.cpp TKeywordExtractor.cpp TTrie.cpp TSegments.cpp )
+ADD_EXECUTABLE(test.run 
+    gtest_main.cpp 
+    TKeywordExtractor.cpp 
+    TTrie.cpp 
+    TSegments.cpp 
+    TPosTagger.cpp
+)
 TARGET_LINK_LIBRARIES(gtest pthread)
 TARGET_LINK_LIBRARIES(test.run gtest pthread)
 
diff --git a/test/unittest/TPosTagger.cpp b/test/unittest/TPosTagger.cpp
new file mode 100644
index 0000000..3f32e7e
--- /dev/null
+++ b/test/unittest/TPosTagger.cpp
@@ -0,0 +1,17 @@
+#include "src/PosTagger.hpp"
+#include "gtest/gtest.h"
+
+using namespace CppJieba;
+
+const char * const QUERY_TEST1 = "我是蓝翔技工拖拉机学院手扶拖拉机专业的。不用多久，我就会升职加薪，当上总经理，出任CEO，迎娶白富美，走上人生巅峰。";
+const char * const ANS_TEST1 = "[\"我:r\", \"是:v\", \"蓝翔:x\", \"技工:n\", \"拖拉机:n\", \"学院:n\", \"手扶拖拉机:n\", \"专业:n\", \"的:uj\", \"。:x\", \"不用:v\", \"多久:m\", \"，:x\", \"我:r\", \"就:d\", \"会:v\", \"升职:v\", \"加薪:nr\", \"，:x\", \"当上:t\", \"总经理:n\", \"，:x\", \"出任:v\", \"CEO:x\", \"，:x\", \"迎娶:v\", \"白富:x\", \"美:ns\", \"，:x\", \"走上:v\", \"人生:n\", \"巅峰:n\", \"。:x\"]";
+
+TEST(PosTaggerTest, Test1)
+{
+    PosTagger tagger("../dict/jieba.dict.utf8", "../dict/hmm_model.utf8");
+    vector<pair<string, string> > res;
+    tagger.tag(QUERY_TEST1, res);
+    string s;
+    s << res;
+    ASSERT_TRUE(s == ANS_TEST1);
+}