Abstract:Based on the perspective of social relations network, the article examines the direct effect of Interlocking directorates on firm technological innovation performance, R D investment and the mediating effect of R D investment from three aspects of network centrality, network intensity and network specialization. Based on a database covering all the listed manufacturing corporations from 2011 to 2015, the empirical results show that network centrality, network intensity and network specialization have a significant effect on the technological innovation performance and the R D investment has a mediating effect between them.The influence mechanism can be partly explained as below: Interlocking directorate network can increase the proportion of R D investment through the transmission of resources and information in the network, and the increase of R D investment can directly improve the technological innovation performance of the enterprise.