In recently years, detecting communities of social networks has made considerable progress, and has been widely applied in the social networks, World Wide Web, biological networks and many other fields. For the hot issues of community detection in social network, firstly the correlate clustering algorithms based on local information are studied and summarized. Secondly, the label propagation algorithm that is short for Label Propagation Algorithm(LPA)is researched and analyzed in-depth, in order to solve th...