Abstract:This paper delves into the factors influencing firm research and development collaboration while exploring new methods for more accurate measurement of corporate financing constraints. Using data from the World Bank's 2012 survey of 1,484 Chinese enterprises, including 667 engaged in research and development activities and 143 in research and development collaboration, we directly utilize relevant key indicators and data. We also attempt to measure the core explanatory variable, corporate financing constraints, by directly employing a subjective measurement method based on companies' own perceptions of financial difficulties. We examine the impact of financing constraints on firm decisions regarding research and development collaboration and investment scale by constructing Probit binary choice models and linear regression models. We use three instrumental variables at the firm level to mitigate endogeneity issues arising from reverse causality. Furthermore, we conduct robustness tests by replacing the explanatory variable with a binary dummy variable indicating the presence of financing constraints and by reducing the sample to firms engaged in research and development activities. We further conduct heterogeneity analysis by distinguishing industries, firm sizes, and nature. The results show that financing constraints to some extent reduce firm research and development investment but significantly enhance the possibility and scale of research and development collaboration among firms. The impact of financing constraints on firm research and development collaboration is more pronounced in firms with a high degree of external financing dependence, small firms, and private enterprises. Therefore, it is necessary to improve financial markets, gradually eliminate information asymmetry between research and development firms and financial institutions, reduce financing costs, and accelerate the reconfiguration of innovation resources among firms, promoting overall industrial innovation and technological advancement in China.".