With the growing popularity of Web 2.0, microblog as an important social media, with its rapid propagation and strong interaction, has been received extensive attention. Many scholars have studied the influence of user in microblog. Discusses the definition of the influence in microblog, and gives a summarize to the current influence analysis, including the network-based model and topic -based model. Ana-lyzes the advantages and disadvantages of each model. Proposes future research trends in the field.