diff --git a/README_EN.md b/README_EN.md
deleted file mode 100644
index ce8f4e79..00000000
--- a/README_EN.md
+++ /dev/null
@@ -1,115 +0,0 @@
-# CppJieba [简体中文](README.md)
-
-[![Build Status](https://travis-ci.org/yanyiwu/cppjieba.png?branch=master)](https://travis-ci.org/yanyiwu/cppjieba) 
-[![Author](https://img.shields.io/badge/author-@yanyiwu-blue.svg?style=flat)](http://yanyiwu.com/) 
-[![Platform](https://img.shields.io/badge/platform-Linux,%20OS%20X,%20Windows-green.svg?style=flat)](https://github.com/yanyiwu/cppjieba)
-[![Performance](https://img.shields.io/badge/performance-excellent-brightgreen.svg?style=flat)](http://yanyiwu.com/work/2015/06/14/jieba-series-performance-test.html) 
-[![License](https://img.shields.io/badge/license-MIT-yellow.svg?style=flat)](http://yanyiwu.mit-license.org)
-[![Build status](https://ci.appveyor.com/api/projects/status/wl30fjnm2rhft6ta/branch/master?svg=true)](https://ci.appveyor.com/project/yanyiwu/cppjieba/branch/master)
-
-[![logo](http://7viirv.com1.z0.glb.clouddn.com/CppJiebaLogo-v1.png)](https://github.com/yanyiwu/cppjieba)
-
-## Introduction
-
-The Jieba Chinese Word Segmentation Implemented By C++ .
-
-## Usage 
-
-### Dependencies
-
-+ `g++ (version >= 4.1 is recommended) or clang++`;
-+ `cmake (version >= 2.6 is recommended)`;
-
-### Download & Compile
-
-```sh
-git clone --depth=10 --branch=master git://github.com/yanyiwu/cppjieba.git
-cd cppjieba
-mkdir build
-cd build
-cmake ..
-make
-```
-
-### Unit Testing
-
-```
-make test
-```
-
-## Demo
-
-```
-./demo
-```
-
-Output:
-
-```
-[demo] Cut With HMM
-他/来到/了/网易/杭研/大厦
-[demo] Cut Without HMM
-他/来到/了/网易/杭/研/大厦
-我来到北京清华大学
-[demo] CutAll
-我/来到/北京/清华/清华大学/华大/大学
-小明硕士毕业于中国科学院计算所，后在日本京都大学深造
-[demo] CutForSearch
-小明/硕士/毕业/于/中国/科学/学院/科学院/中国科学院/计算/计算所/，/后/在/日本/京都/大学/日本京都大学/深造
-[demo] Insert User Word
-男默/女泪
-男默女泪
-[demo] CutForSearch Word With Offset
-[{"word": "小明", "offset": 0}, {"word": "硕士", "offset": 6}, {"word": "毕业", "offset": 12}, {"word": "于", "offset": 18}, {"word": "中国", "offset": 21}, {"word": "科学", "offset": 27}, {"word": "学院", "offset": 30}, {"word": "科学院", "offset": 27}, {"word": "中国科学院", "offset": 21}, {"word": "计算", "offset": 36}, {"word": "计算所", "offset": 36}, {"word": "，", "offset": 45}, {"word": "后", "offset": 48}, {"word": "在", "offset": 51}, {"word": "日本", "offset": 54}, {"word": "京都", "offset": 60}, {"word": "大学", "offset": 66}, {"word": "日本京都大学", "offset": 54}, {"word": "深造", "offset": 72}]
-[demo] Tagging
-我是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CEO，走上人生巅峰。
-[我:r, 是:v, 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, CEO:eng, ，:x, 走上:v, 人生:n, 巅峰:n, 。:x]
-[demo] Keyword Extraction
-我是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CEO，走上人生巅峰。
-[{"word": "CEO", "offset": [93], "weight": 11.7392}, {"word": "升职", "offset": [72], "weight": 10.8562}, {"word": "加薪", "offset": [78], "weight": 10.6426}, {"word": "手扶拖拉机", "offset": [21], "weight": 10.0089}, {"word": "巅峰", "offset": [111], "weight": 9.49396}]
-```
-
-Please see details in `test/demo.cpp`.
-
-## Cases
-
-+ [GoJieba] 
-+ [NodeJieba]
-+ [simhash]
-+ [exjieba]
-+ [jiebaR]
-+ [cjieba]
-+ [jieba_rb]
-+ [iosjieba]
-+ [SqlJieba]
-+ [pg_jieba]
-+ [ngx_http_cppjieba_module]
-+ [gitbook-plugin-search-pro]
-+ [cppjieba-server]
-+ [perl5-jieba]
-+ [jieba-dlang]
-
-## Contact
-
-+ Email: `i@yanyiwu.com`
-+ QQ: 64162451
-+ WeChat: ![image](http://7viirv.com1.z0.glb.clouddn.com/5a7d1b5c0d_yanyiwu_personal_qrcodes.jpg)
-
-[GoJieba]:https://github.com/yanyiwu/gojieba
-[CppJieba]:https://github.com/yanyiwu/cppjieba
-[jannson]:https://github.com/jannson
-[cppjiebapy]:https://github.com/jannson/cppjiebapy
-[cppjiebapy_discussion]:https://github.com/yanyiwu/cppjieba/issues/1
-[NodeJieba]:https://github.com/yanyiwu/nodejieba
-[jiebaR]:https://github.com/qinwf/jiebaR
-[simhash]:https://github.com/yanyiwu/simhash
-[exjieba]:https://github.com/falood/exjieba
-[cjieba]:http://github.com/yanyiwu/cjieba
-[jieba_rb]:https://github.com/altkatz/jieba_rb
-[iosjieba]:https://github.com/yanyiwu/iosjieba
-[SqlJieba]:https://github.com/yanyiwu/sqljieba
-[pg_jieba]:https://github.com/jaiminpan/pg_jieba
-[gitbook-plugin-search-pro]:https://plugins.gitbook.com/plugin/search-pro
-[cppjieba-server]:https://github.com/yanyiwu/cppjieba-server
-[perl5-jieba]:https://metacpan.org/pod/distribution/Lingua-ZH-Jieba/lib/Lingua/ZH/Jieba.pod
-[jieba-dlang]:https://github.com/shove70/jieba