Abstract: The Internet becomes a new platform for people to exchange ideas as the birth of Web 2.0.The sample and scope of social science is expanded and the result has more practical values using sentiment analysis techniques to study the information of Internet. Online textual analysis not only expands the tool and content of social science, but also supplies theoretical explanation. The computational social science and computational social psychology are emerging as these two subjects complement. It can be predicted using the Internet to conduct social science research will be the directions and trends of the future research.

Key words: online textual sentiment analysis, emotional structure theories, affective lexicon, computational social science