Knowledge absorptive capacity is essential for the development of enterprises in the era of knowledge economy.Trust relationship is the key factor of knowledge absorptive capacity in the service outsourcing enterprises.This study discussed the influence of the interpersonal communication and organizational commitment on the knowledge absorption capacity and did an empirical research as example of service outsourcing enterprises by using the structural equation model.The results show that interpersonal communication, organizational commitment and knowledge absorptive capacity is positive correlation.