With the rapidly changing of external environment and deepened industry competition, private company has to improve its management level, the key problem about how to improve management level is how to bring TMT into full play. Comparing with on-site interviews and case analysis, the author did comparison analysis of two private groups, analyzed their construct process of TMT, decision process, organization performance. The research shows the features of constructing TMT caused different TMT, which also has significant influence on decision model and decision performance.