I install sogou 中文输入法 successfully, after following below steps:
1. install sogou pingyin by deb package, in http://pinyin.sogou.com/linux/
2. setup "Input Method Configuration" as fcitx and re-login Ubuntu.
Refer to http://jingyan.baidu.com/article/a3aad71aa1abe7b1fa009641.html
3. setup "Input Method" as fcitx in "Language Support" panel, and then re-login Ubuntu。
Refer to http://jingyan.baidu.com/article/ad310e80ae6d971849f49ed3.html