Abstract: Based on structural、cognitive and relational capital, this paper research the impact of social capital in scientific research cooperation networks on scientists' scientific research performance.The author collected 267,400 papers in the field of chemistry from the web of science, constructed a collaboration network of scientists based on the data of the authors of these papers.The social capital of resercher is measured from three aspects: structural、cognitive and relationship capital.The research results show that cognitive dimension social capital and relationship dimension social capital have a significant role in promoting scientific research performance, while structural dimension social capital has a significant non-linear relationship to scientific research performance of researchers. This article provides some reference for the establishment of an active and effective scientific research cooperation network and the efficient use of social capital in the cooperation network for scientists.