Abstract: Transactive memory system is helpful for team members to form an effective understanding of the team's knowledge distribution and play an important role in improving team performance. However, there are still few studies on the impact of social interaction and behavioral motivations of team members on transactive memory systems in the different stages of the team's task.
This study introduces the method of social network structure in the context of nested social interactions and social identity theory used to study the individual behavior and collective behavior in the group, and the experimental investigation method is applied to 43 student teams. This paper analyzes the influence of interactive memory system on team performance under different time periods. The empirical process is used to test the effect of transactive memory system on team performance at different periods.
The results show that:in the whole life cycle of the team's task, TMS positively influences team performance; the impact of TMS on team performance is negatively moderated by team social identity and positively moderated by team social network density; team social network centralization play a positive moderating role in the post-formation stage. This study reveals that the different roles of team network structure and social identity in the relationship between TMS and team performance in different periods and explores the role of TMS in different organizational structures and atmosphere.

Key words: transactive memory system, social identity, social network, team performance