The report of the 19th CPC National Congress points out that it is necessary to develop China’s industries to the high-end of the global value chain from the national level, and promote the deep integration of the Internet, big data, artificial intelligence, and the real economy. The interaction between the Internet industry and the related industries has broken through the traditional interrelated and mutually-integrated boundaries, and developed towards a deeper coupling direction. Especially after the close coupling with commerce, finance and service as the representatives of the tertiary industry, new industries such as E-commerce, Internet of Things, Internet finance and shared travel have emerged. Meanwhile, new economic forms such as sharing economy have appeared. With the expansion of the coupling field and the deepening of the coupling, it is more important to predict and evaluate the coupling results between the industries. In this paper, the example cited is that Internet industry and financial industry are coupled with the birth of the Internet Financial industry. Based on the grey correlation method and entropy method, this paper conducts quantitative studies on the coupling and sustainable development abilities of bilateral industries, and obtains the coupled momentum method to judge the ability of bilateral industrial coupling and sustainable development.