The earthquake departments in China have begun to carry out the government affairs with the help of official Microblog. Using the social network analysis method,the study selected the official Microblog of provincial earthquake departments with high influence and representative as research objects,and constructed the social network relationship map. Applying UCINET software,in-depth analysis and research were carried out among varied aspects such as centrality and cohesive subgroups,and comprehensive discusses were made on the promotion and application of official Microblog in earthquake departments,and their relevant cooperation and exchanges. Then feasible development suggestions were put forward.