To explore the way in which enterprises improve project performance through managing the project managers, this study examines the influence of perceived trust of project managers on project performance from the perspective of project management, and builds a mediating model which shows the mediating effects of organizational commitment between perceived trust of project managers and project performance. By means of 232 samples of project managers from different areas including chemical engineering construction, consulting, real estate and so on, we test the model by applying hierarchical regression, correlation analysis, Bootstrap analysis and other statistical methods. Results of the analyses suggest that perceived cognitive trust of project managers has significant effect on affective commitment, normative commitment and continuance commitment, while perceived affective trust only affects affective commitment and normative commitment significantly with the exception of continuance commitment. Project managers' perceived trust not only has a direct positive effect on project performance, but also has indirect impacts via the influence of affective and normative commitment. As for the mediating effects of organizational commitment, affective commitment makes the most impact, normative commitment comes second and continuance commitment doesn' t have any mediating effect between affective or cognitive trust and project performance. The results also show that project managers' perceived cognitive trust plays a more significant effect on organizational commitment and project performance than their perceived affective trust, for the reason of the special characters of project manager's responsibility. These findings suggest that enterprises should build the trust of project managers' perception, especially the perceived cognitive trust, and take full advantage of affective and normative commitments of project managers in project management; Moreover, more attention should be paid to nurture the perceived affective trust and continuance commitment of project managers from a long-term perspective of enterprise sustainable development.