Abstract: Social capital is the foundation for the stable operation of collaborative innovation networks of the strategic emerging industries and the key to improve the performance of industrial collaborative innovation. Based on the resource base theory and social capital theory, this paper took the patent data of the collaborative application of the new energy automobile industry from 1985 to 2022 as a sample, and utilized the social network analysis and exponential random graph model to explore the dynamic impact of social capital on the collaborative innovation network of strategic emerging industries. The research conclusions are as follows: (1) Bonding mode has a significant positive influence on collaborative innovation network cooperative relationship in the growth and maturity period, and the degree of influence tends to increase. (2) Knowledge base depth homogeneity has sustained significant positive influence on collaborative innovation network cooperative relationship in the germination, growth and maturity periods. (3) The positive influence of institutional environment similarity on the collaborative innovation network relationships shows an inverted "U" trend, the facilitating effect of organizational structure similarity gradually diminishes, and the positive influence of cooperation experience similarity significantly increases. Finally, corresponding countermeasure suggestions are given from the three aspects of playing the leading role of innovation of industry leading enterprises, improving the basic research capacity of enterprises, and stabilizing the cooperative relationship of innovation subjects. The results of the study will expand the application of social capital theory in the research field of collaborative innovation network, which has certain practical significance in promoting the sustainable development of collaborative innovation network in strategic emerging industries.

Key words: social capital, collaborative innovation network, strategic emerging industry, exponential random graph model, social network analysis