Customer collaborative product innovation system is a complex collaborative knowledge work network system with multi-agent involved. Aiming at complex characteristics of customer collaborative innovation process, customer collaborative innovation networks(CCIN）is defined, CCIN topology model is proposed and important parameters of CCIN are calculated. In addition, the network structure and characteristics are analyzed. The results show that CCIN has the characteristics of scale-free and small world. The research results provide theoretical basis for the research on mechanisms of knowledge dissemination among agents and dynamical characteristics of network transmission.