Abstract: Under the new wave of technological revolution and industrial change, digital technologies and their products or services have become an effective means to improve the efficiency and effectiveness of industries. The driving mechanism of digital industry convergence is sorted out based on the supply and demand of digital inputs, and the paths and effects of digital industry convergence in China and the America are analyzed using the latest input-output tables of both countries. The study finds that China's digital industry (especially digital product manufacturing) is at the low end of the "smile curve" and the value-added rate of the industry is low. Path analysis based on the degree of convergence found that, China's digital industry mainly promotes the digital transformation of industry and agriculture with digital hardware and its delivery, and knowledge and technology-intensive manufacturing is the key of its convergence; while the America's digital industry mainly promotes the digital transformation of service industry with digital services, among which producer service is the key of its convergence. The analysis of convergence effects reveals that the core sectors that drive or induce value added in the digital industry in China and the America are knowledge- and technology-intensive manufacturing, construction, and social, producer, and distribution services, respectively, all from the key areas of digital convergence in both countries. And the penetration intensity of digital industry to traditional industries such as energy and resource-based industry is not high, and their value added is not strongly driven or induced by the latter, which is the area where the future convergence development of digital industries in both countries should focus on breaking through. In addition, the convergence of China's digital industry should also strengthen digital service input, explore new modes of application of digital and traditional factors, and expand the space of data valorization.