This research is to verify the relationship and effects between team shared mental model, team process and team performance. The research objects are the 24 baseball teams of the 37^(th) South Senior High Baseball League. There were 360 questionnaires were distributed, and 258 valid questionnaires were returned. The valid response rate is 71.7%. After analysis and research, the result shows that team shared mental model (TSMM) can positively affect team unity, team satisfaction, team trust and the results of the competition. Team unity effects team satisfaction positively. Team trust can effect team satisfaction and the results of the competition positively. Therefore, team unity and team trust both can be the significant moderated‐mediation effect throughout the competition. This result could be the reference for senior high school coaches.