Abstract: Year 2011 can be called as the first year of microblog application. Chinese microblog continued the momentum of rapid development in 2010, permeating into the social life deeply in an increasing way. Microblog continues to maintain the high speed development, "two strong consistent" market structure is preliminarily forming.Microblog has grown into the centre of media storm and one of the most mainstream media in fact. Government microblog has become the new field where official and people can communicate with each other, and microblog governance has become a common practice. Microblog's commercial value highlights, which make microblog become an important platform for enterprise marketing and public relations,Traditional media and microblog support each other and complement one another with the advantages, which make them develop in the competition. The influence of microblog opinion leader is prominent, and it has a strong agenda setting ability in the public event. Microblog promotes the network mobilization warm up, and the force of pulling powers together can not be ignored.Besides, microblog also leads the popular culture, and changes the mode of social life, revealing deeper influence on Chinese society. At the same time, microblog rumors continue to come about, which may bring certain adverse influence on the social stability. <<