With the advent of the Web 2.0, many users share their opinions about certain brand, product or people. It is important to mine valuable information from these user generated contents. Compared to other platforms in Internet, Microblog services are simple, updated fast, and are easy-to-use. It attracts users to share sentiment-rich opinions on Microblog services. Our research focuses on the opinion analysis on Microblog in multilanguage. This work spans across different important research fields, including database, natural language processing and machine learning.