SNS iS a new forln of interaction,during which reflects self—organization.The seIf—organization behavior in SNS iS mainly reflected in users'autopoietic and self—growth.adaptive and self—stablization in the course of interac. tions.Renren Network iS a self—organizing system that can get interactive relationship between the structure of groups without outside particular intervention scenario.So anaylizing the self—organization behaviors in Renren Network pro. vides US a platform for searching on seIf—organization behaviors in SNS.