[Purpose/significance]A behavioral phenomenon of information cocoon retention exists in the context of network stratification.Studying the characteristics and influencing factors of retention behavior can help dig out the reasons for the formation and consolidation of the information cocoon,help social media users to enhance the awareness of"breaking the cocoon",and pro-vide ideas and strategies for the governance of cyberspace.[Method/process]Taking Douban group users as samples,this paper first explores the performance characteristics of social media users'information cocoon retention behavior through in-depth inter-views and open coding.Based on the results of qualitative analysis,we construct a model of factors influencing information cocoon lingering behavior,collect questionnaire data to test the hypotheses,and use fsQCA to conduct supplementary analysis from a group perspective.[Result/conclusion]The study concludes that the performance characteristics of social media users'information co-coon retention behavior are diverse,and the factors affecting this behavior include system function,circle building,performance expectations,hedonic motivation,usage habits,information homogeneity,and information overload,and the path of causes of so-cial media users'information cocoon retention behavior is complex.