Abstract-From the management practice and research status of perceived overqualification, knowledge sharing is introduced as an intermediary variable, this paper construct a theoretical model of perceived overqualification, knowledge sharing and team performance , focusing on the effect of employee perceived overqualified on team performance, aims to uncover the "black-box" mechanism of perceived overqualified affect team performance.Through empirical analysis found that (1) perceived overqualification positively influences task performance of the teams, (2) perceived overqualification does not obviously influence growing performance of the teams, (3) perceived overqualification positively influences knowledge sharing of the teams, and (4) knowledge sharing partially mediates the effects of perceived overqualification on team task performance. Therefore, the enterprises should hold a thorough understanding of positive and negative effects of perceived overqualification. Finally, it is suggested that enterprises take appropriate human resources approaches to promote knowledge sharing and team performance.