Abstract:Choosing the right time to establish a stable relationship with suppliers is an important prerequisite for improving the innovation performance of manufacturers. However, most of the existing researches ignore the important factor of cooperation timing, or simply use dichotomy to separate the timing stage. Therefore, the cooperation timing between manufacturers and suppliers is divided into the stages of creative idea generation, technology incubation, product development, product diffusion and commercialization. Based on 472 questionnaire survey data from manufacturers, this paper empirically analyzes the influence of cooperation timing between manufacturers and suppliers on enterprise innovation performance by using multiple regression method, and explores the contingency role of technological knowledge novelty and market knowledge novelty based on knowledge view. The results show that: (1) Manufacturers usually choose to establish connections with suppliers at the stages of technology incubation, product development and product diffusion, and the influence of cooperation timing on innovation performance presents an inverted U-shaped relationship. In the middle stage, the establishment of cooperation with suppliers can promote the improvement of innovation performance of manufacturers. (2) Both technical knowledge novelty and market knowledge novelty have a positive moderating effect on the relationship between manufacturer and supplier cooperation opportunity and innovation performance. Therefore, manufacturers should attach importance to the timing of cooperation with suppliers, and formulate differentiated supplier activation and introduction strategies according to different innovation stages.