Abstract:The digital infrastructure is the cornerstone for China's development of the digital economy. Based on the IT productivity paradox, whether digital infrastructure can enhance total factor productivity and promote high-quality economic development is an urgent research question. This article employs static game theory and evolutionary dynamic game models to analyze the impact mechanism of digital infrastructure on total factor productivity. It empirically verifies, using data from listed companies from 2013 to 2020, the effect of digital infrastructure on enterprise total factor productivity and the mediating effect of enterprise digital transformation. The results show that digital infrastructure enhances enterprise total factor productivity, and enterprise digital transformation serves as an important intermediate mechanism, addressing the IT productivity paradox. The promotion effect of digital infrastructure on total factor productivity in the primary industry is much greater than that in the secondary and tertiary industries. Additionally, its positive effect on total factor productivity in high-end manufacturing industries is significantly higher than in other secondary industries. Therefore, there is an urgent need for the government to strengthen digital infrastructure, vigorously support and guide enterprises in digital transformation, and formulate differentiated digital development policies tailored to different industries and enterprises.