diff --git a/ChangeLog.md b/ChangeLog.md
index 65fd53c..079ca19 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -4,6 +4,7 @@
 
 1. 支持多个userdict载入，多词典路径用英文冒号(:)作为分隔符，就当是向环境变量PATH致敬，哈哈。
 2. userdict是不带权重的，之前对于新的userword默认设置词频权重为最大值，现已支持可配置，默认使用中位值。
+3. 修改一些代码风格，比如命名空间小写化，从CppJieba变成cppjieba。
 
 ## v3.2.1
 
diff --git a/server/server.cpp b/server/server.cpp
index 8c8274c..9279801 100644
--- a/server/server.cpp
+++ b/server/server.cpp
@@ -8,11 +8,11 @@
 #include "Jieba.hpp"
 
 using namespace husky;
-using namespace CppJieba;
+using namespace cppjieba;
 
 class ReqHandler: public IRequestHandler {
  public:
-  ReqHandler(const CppJieba::Jieba& jieba)
+  ReqHandler(const cppjieba::Jieba& jieba)
    : jieba_(jieba) {
   }
 
@@ -63,7 +63,7 @@ class ReqHandler: public IRequestHandler {
     }
   }
  private:
-  const CppJieba::Jieba& jieba_;
+  const cppjieba::Jieba& jieba_;
 };
 
 bool Run(int argc, char** argv) {
@@ -83,7 +83,7 @@ bool Run(int argc, char** argv) {
 
   LogInfo("config info: %s", conf.getConfigInfo().c_str());
   
-  CppJieba::Jieba jieba(dictPath, 
+  cppjieba::Jieba jieba(dictPath, 
         modelPath, 
         userDictPath);
   
diff --git a/src/DictTrie.hpp b/src/DictTrie.hpp
index 39b6b8a..c704644 100644
--- a/src/DictTrie.hpp
+++ b/src/DictTrie.hpp
@@ -13,7 +13,7 @@
 #include "TransCode.hpp"
 #include "Trie.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 using namespace limonp;
 
diff --git a/src/FullSegment.hpp b/src/FullSegment.hpp
index e3c2fc1..0464e05 100644
--- a/src/FullSegment.hpp
+++ b/src/FullSegment.hpp
@@ -9,7 +9,7 @@
 #include "SegmentBase.hpp"
 #include "TransCode.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 class FullSegment: public SegmentBase {
  public:
   FullSegment(const string& dictPath) {
diff --git a/src/HMMModel.hpp b/src/HMMModel.hpp
index ae07703..625507c 100644
--- a/src/HMMModel.hpp
+++ b/src/HMMModel.hpp
@@ -3,7 +3,7 @@
 
 #include "limonp/StringUtil.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 using namespace limonp;
 typedef unordered_map<uint16_t, double> EmitProbMap;
@@ -137,6 +137,6 @@ struct HMMModel {
   vector<EmitProbMap* > emitProbVec;
 }; // struct HMMModel
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif
diff --git a/src/HMMSegment.hpp b/src/HMMSegment.hpp
index 90daa56..839a610 100644
--- a/src/HMMSegment.hpp
+++ b/src/HMMSegment.hpp
@@ -8,7 +8,7 @@
 #include "HMMModel.hpp"
 #include "SegmentBase.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 class HMMSegment: public SegmentBase {
  public:
   HMMSegment(const string& filePath) {
@@ -175,6 +175,6 @@ class HMMSegment: public SegmentBase {
   bool isNeedDestroy_;
 }; // class HMMSegment
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif
diff --git a/src/Jieba.hpp b/src/Jieba.hpp
index 879134b..bbe88fc 100644
--- a/src/Jieba.hpp
+++ b/src/Jieba.hpp
@@ -5,7 +5,7 @@
 #include "PosTagger.hpp"
 #include "LevelSegment.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 class Jieba {
  public:
diff --git a/src/KeywordExtractor.hpp b/src/KeywordExtractor.hpp
index 3f6acd5..6977fdd 100644
--- a/src/KeywordExtractor.hpp
+++ b/src/KeywordExtractor.hpp
@@ -5,7 +5,7 @@
 #include <cmath>
 #include <set>
 
-namespace CppJieba {
+namespace cppjieba {
 using namespace limonp;
 
 /*utf8*/
diff --git a/src/LevelSegment.hpp b/src/LevelSegment.hpp
index dbc37d1..0fc14dc 100644
--- a/src/LevelSegment.hpp
+++ b/src/LevelSegment.hpp
@@ -3,7 +3,7 @@
 
 #include "MPSegment.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 class LevelSegment: public SegmentBase{
  public:
@@ -77,6 +77,6 @@ class LevelSegment: public SegmentBase{
   MPSegment mpSeg_;
 }; // class LevelSegment
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif // CPPJIEBA_LEVELSEGMENT_H
diff --git a/src/MPSegment.hpp b/src/MPSegment.hpp
index bcf5c99..f031fdc 100644
--- a/src/MPSegment.hpp
+++ b/src/MPSegment.hpp
@@ -8,7 +8,7 @@
 #include "DictTrie.hpp"
 #include "SegmentBase.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 class MPSegment: public SegmentBase {
  public:
@@ -109,6 +109,6 @@ class MPSegment: public SegmentBase {
   bool isNeedDestroy_;
 }; // class MPSegment
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif
diff --git a/src/MixSegment.hpp b/src/MixSegment.hpp
index 8d8a8b6..5732654 100644
--- a/src/MixSegment.hpp
+++ b/src/MixSegment.hpp
@@ -6,7 +6,7 @@
 #include "HMMSegment.hpp"
 #include "limonp/StringUtil.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 class MixSegment: public SegmentBase {
  public:
   MixSegment(const string& mpSegDict, const string& hmmSegDict, 
@@ -86,6 +86,6 @@ class MixSegment: public SegmentBase {
 
 }; // class MixSegment
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif
diff --git a/src/PosTagger.hpp b/src/PosTagger.hpp
index 076d9f3..8148a10 100644
--- a/src/PosTagger.hpp
+++ b/src/PosTagger.hpp
@@ -5,7 +5,7 @@
 #include "limonp/StringUtil.hpp"
 #include "DictTrie.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 using namespace limonp;
 
 static const char* const POS_M = "m";
@@ -74,6 +74,6 @@ class PosTagger {
   MixSegment segment_;
 }; // class PosTagger
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif
diff --git a/src/PreFilter.hpp b/src/PreFilter.hpp
index bea43f0..64caa7a 100644
--- a/src/PreFilter.hpp
+++ b/src/PreFilter.hpp
@@ -3,7 +3,7 @@
 
 #include "TransCode.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 //class PreFilterIterator {
 // public:
@@ -56,6 +56,6 @@ class PreFilter {
   const unordered_set<Rune>& symbols_;
 }; // class PreFilter
 
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif // CPPJIEBA_PRE_FILTER_H
diff --git a/src/QuerySegment.hpp b/src/QuerySegment.hpp
index b5d7bb4..7c95035 100644
--- a/src/QuerySegment.hpp
+++ b/src/QuerySegment.hpp
@@ -12,7 +12,7 @@
 #include "TransCode.hpp"
 #include "DictTrie.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 class QuerySegment: public SegmentBase {
  public:
   QuerySegment(const string& dict, const string& model, const string& userDict = "", size_t maxWordLen = 4)
diff --git a/src/SegmentBase.hpp b/src/SegmentBase.hpp
index f1ece55..12980d0 100644
--- a/src/SegmentBase.hpp
+++ b/src/SegmentBase.hpp
@@ -6,7 +6,7 @@
 #include <cassert>
 
 
-namespace CppJieba {
+namespace cppjieba {
 
 //const char* const SPECIAL_CHARS = " \t\n，。";
 const Rune SPECIAL_SYMBOL[] = {32u, 9u, 10u, 65292u, 12290u};
@@ -32,6 +32,6 @@ class SegmentBase {
   unordered_set<Rune> symbols_;
 }; // class SegmentBase
 
-} // CppJieba
+} // cppjieba
 
 #endif
diff --git a/src/TransCode.hpp b/src/TransCode.hpp
index 5583f46..feba971 100644
--- a/src/TransCode.hpp
+++ b/src/TransCode.hpp
@@ -9,7 +9,7 @@
 #include "limonp/StringUtil.hpp"
 #include "limonp/LocalVector.hpp"
 
-namespace CppJieba {
+namespace cppjieba {
 
 using namespace limonp;
 
@@ -65,6 +65,6 @@ inline void encode(const vector<Unicode>& input, vector<string>& output) {
 }
 
 } // namespace TransCode
-} // namespace CppJieba
+} // namespace cppjieba
 
 #endif
diff --git a/src/Trie.hpp b/src/Trie.hpp
index 8ab502b..4fbaa11 100644
--- a/src/Trie.hpp
+++ b/src/Trie.hpp
@@ -5,7 +5,7 @@
 #include <vector>
 #include <queue>
 
-namespace CppJieba {
+namespace cppjieba {
 using namespace std;
 
 const size_t MAX_WORD_LENGTH = 512;
diff --git a/test/demo.cpp b/test/demo.cpp
index ab1c21d..2477b20 100644
--- a/test/demo.cpp
+++ b/test/demo.cpp
@@ -3,7 +3,7 @@
 using namespace std;
 
 int main(int argc, char** argv) {
-  CppJieba::Jieba jieba("../dict/jieba.dict.utf8",
+  cppjieba::Jieba jieba("../dict/jieba.dict.utf8",
                             "../dict/hmm_model.utf8",
                             "../dict/user.dict.utf8");
   vector<string> words;
diff --git a/test/load_test.cpp b/test/load_test.cpp
index 26d3a54..44aee66 100644
--- a/test/load_test.cpp
+++ b/test/load_test.cpp
@@ -7,7 +7,7 @@
 #include "../src/KeywordExtractor.hpp"
 #include "../src/limonp/Colors.hpp"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 void cut(size_t times = 50) {
   MixSegment seg("../dict/jieba.dict.utf8", "../dict/hmm_model.utf8");
diff --git a/test/unittest/jieba_test.cpp b/test/unittest/jieba_test.cpp
index e5ec8fb..eaaf548 100644
--- a/test/unittest/jieba_test.cpp
+++ b/test/unittest/jieba_test.cpp
@@ -1,10 +1,10 @@
 #include "src/Jieba.hpp"
 #include "gtest/gtest.h"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 TEST(JiebaTest, Test1) {
-  CppJieba::Jieba jieba("../dict/jieba.dict.utf8",
+  cppjieba::Jieba jieba("../dict/jieba.dict.utf8",
                             "../dict/hmm_model.utf8",
                             "../dict/user.dict.utf8");
   vector<string> words;
@@ -58,7 +58,7 @@ TEST(JiebaTest, Test1) {
 }
 
 TEST(JiebaTest, InsertUserWord) {
-  CppJieba::Jieba jieba("../dict/jieba.dict.utf8",
+  cppjieba::Jieba jieba("../dict/jieba.dict.utf8",
                             "../dict/hmm_model.utf8",
                             "../dict/user.dict.utf8");
   vector<string> words;
diff --git a/test/unittest/keyword_extractor_test.cpp b/test/unittest/keyword_extractor_test.cpp
index ca1041d..1b9327d 100644
--- a/test/unittest/keyword_extractor_test.cpp
+++ b/test/unittest/keyword_extractor_test.cpp
@@ -1,7 +1,7 @@
 #include "src/KeywordExtractor.hpp"
 #include "gtest/gtest.h"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 TEST(KeywordExtractorTest, Test1) {
   KeywordExtractor extractor("../test/testdata/extra_dict/jieba.dict.small.utf8", "../dict/hmm_model.utf8", "../dict/idf.utf8", "../dict/stop_words.utf8");
diff --git a/test/unittest/pos_tagger_test.cpp b/test/unittest/pos_tagger_test.cpp
index a157a2b..f9733fc 100644
--- a/test/unittest/pos_tagger_test.cpp
+++ b/test/unittest/pos_tagger_test.cpp
@@ -1,7 +1,7 @@
 #include "src/PosTagger.hpp"
 #include "gtest/gtest.h"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 static 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。";
 static 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:eng\", \"，:x\", \"迎娶:v\", \"白富:x\", \"美:ns\", \"，:x\", \"走上:v\", \"人生:n\", \"巅峰:n\", \"。:x\"]";
diff --git a/test/unittest/pre_filter_test.cpp b/test/unittest/pre_filter_test.cpp
index 12409e2..9dd64f7 100644
--- a/test/unittest/pre_filter_test.cpp
+++ b/test/unittest/pre_filter_test.cpp
@@ -1,7 +1,7 @@
 #include "gtest/gtest.h"
 #include "src/PreFilter.hpp"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 TEST(PreFilterTest, Test1) {
   unordered_set<Rune> symbol;
diff --git a/test/unittest/segments_test.cpp b/test/unittest/segments_test.cpp
index e631a78..9458813 100644
--- a/test/unittest/segments_test.cpp
+++ b/test/unittest/segments_test.cpp
@@ -7,7 +7,7 @@
 #include "src/LevelSegment.hpp"
 #include "gtest/gtest.h"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 TEST(MixSegmentTest, Test1) {
   MixSegment segment("../dict/jieba.dict.utf8", "../dict/hmm_model.utf8");;
diff --git a/test/unittest/trie_test.cpp b/test/unittest/trie_test.cpp
index 035be26..ffdfd8c 100644
--- a/test/unittest/trie_test.cpp
+++ b/test/unittest/trie_test.cpp
@@ -2,7 +2,7 @@
 #include "src/MPSegment.hpp"
 #include "gtest/gtest.h"
 
-using namespace CppJieba;
+using namespace cppjieba;
 
 static const char* const DICT_FILE = "../test/testdata/extra_dict/jieba.dict.small.utf8";