Because of rapid changes in business environment and fierce competition, firms are facing a more competitive environment and a more serious global competition. Many of the previous literatures have indicated that a business which increases its market orientation will improve its market performance. Numerous authors have argued the interdepartmental dynamics as prior factor to market orientation, and relationship commitment are an essential part of successful long-term relationships. Based on previous literatures, this study proposes the structure about interdepartmental dynamics, market orientation, relationship commitment and performance. The purpose of this paper is to find the impact of market orientation and relationship commitment on customer performance. In addition, this suggests interdepartmental dynamics as prior factor to market orientation. Results indicate that interdepartmental connections can reduce interdepartmental conflict, and lower conflict is a key factor of market orientation. Furthermore, this paper finds evidences that support the mediating effects of the relationship commitment between market orientation and customer performance.