With the popular use of microblogs,the contents of Sina Microblog cover information of various fields,and the rang becomes increasingly wider.As a result,when users of the microblog browse news,they may feel confused concerning what they can believe.So they probably turn to others’ feedback.We propose a concept of disputed-level,a new social property of microblogs,which describes the feedback from public.We define the content of disputed-level and build a disputed-level calculation model.In the model,the influencing factors of disputed-level include comments and forwording.We use the sentiment analysis to calculate the disputed-level.The accuracy rate of the model in the experiment can reach  93%,the efficiency  84%,which prove the feasibility of the model.