Abstract: Based on the theories of resource dependence and behavior coordination, this paper analyzes the black box of improving cooperative performance mechanism. Collecting relevant data on the cooperative innovation of 339 high-tech enterprises in the Yangtze river delta region in 2018, and verifies the mechanism of resource complementarity and behavior synergy to improve the cooperative performance of high-tech enterprises by using the structural equation., capturing the effective Promoting path of to improve the cooperation performance of high-tech enterprises, found:（1） "Ability matching → behavior coordination → cooperative performance" is the key path to improve the cooperative performance of high-tech enterprises. (2) resource complementarity and behavior coordination have a significant positive impact on the cooperative innovation performance of high-tech enterprises. (3) subject characteristics have a significant positive impact on the cooperation process. (4) resource characteristics have a differentiated impact on the cooperation process. (5) government support has a significant positive impact on the cooperation process. (6) market environment has a significantly differentiated impact on the cooperation process. Based on this, the paper puts forward some Suggestions to improve the cooperation performance of high-tech enterprises in China effectively.