Abstract: Social media develops rapidly,which makes people pay more attention to the behaviors of influential social media users and the effects to others.Some studies dealt with the measurement of social influence of social media users.However,they usually chose global metrics,such as number of posts and number of fans,rather than other metrics that might consider varied social influences within different fields.So the measurement metrics are general and unspecific.This research chose online data of Digu users as object to study the classifications of users’ posts,and proposed the concept of field influence and the measurement method.At last,the method was verified by a sample study.The results show that it can be well used to measure users’ social influence within different fields.It was also found that the measurement metrics such as the number of fans have no positive correlation with user field influence.

Key words: Social media,Digu website,Field classification,Field influence