This paper builds a conceptual model to reflect the relationships between collaborative innovation network and inno?vation performance based on the absorptive capacity,and uses the structural equation model to analyze and study the model em?pirically through questionnaires received from 239 knowledge-intensive business service firms.The results show that the con?struction of collaborative innovation network has a positive impact on the innovation performance of knowledge-intensive busi?ness service firms and absorptive capacity plays a significant intermediary role in the mechanism.It’s necessary for knowl?edge-intensive business service firms to build and participate in the collaborative innovation network and enhance its absorptive capacity to strengthen the efficiency of the network and improve innovation performance.