Based on the service innovation and knowledge management, viewed the KIBS enterprises in Shanxi as research object, it empirically studies the relationship between knowledge sharing and service innovation performance by the methods of factor analysis and regression analysis. The results show that the ability of both sides, shared environment, tacit knowledge, and professional knowledge in the process of knowledge sharing, which were significantly and positively associated with service innovation performance. And then the research puts forward suggestions promoting sharing effect and innovation performance in KIBS.