Sentiment analysis is a hot issue in the field of Chinese information processing in recent years. Through the analysis and study of emotion on Sina micro-blog, an analysis method based on the main sentence and syntactic dependencies was proposed. First,system use the custom rules to extract the main sentence,and use the CRFs to extract the opinion targets from the main sentence;Then apply the parser to obtain dependencies from main sentence,which can accurately get the evaluation object words that modify opinion targets;Finally,calculate the sentence emotional tendencies by emotional dictionar...