Top management team was thought to be one of the most important internal factors that affect firm’s strategy and performance. Thus, the study of top management team has emerged as a popular topic in strategic management theoretical research. Previous studies on TMT- performance relationship paid considerable attention to the influence of demographic characteristics or team diversity. However, there are fewer quantitative emperical studies expolred the effect of TMT faultlines and CEO power change. In this study, we use a sample of 240 high-tech enterprises listed on ShangHai and ShenZheng stock market to examine the nonlinear relationship between TMT faultlines and firm performance, and the moderation effects of the power feature of team managers. Results of data analysis show that the relationship between different types of TMT faultlines and firm performance is varied form each other. That is, task related faultlines have an inverted U-shaped relationship with firm performance and social category faultlines have a U-shaped relationship with firm performance. In addition, CEO power would negatively moderate the effect of TMT faultlines on firm performance, weaken the positive effect of task related faultlines and the negative influence of social category faultlines. Relative research and analysis of this article possesses important reference meaning to integrate TMT cognitive resources and deepen the follow-up research.