Existing literature has revealed that the Internet can promote the expansion of international trade by reducing the cost of trade.This paper argues that the Internet can not only reduce the cost of trade,but also expand the scale of service trade by improving the tradability of services and promoting the innovative development of the service industry.By using the data from China and other countries of bilateral trade in services and Internet penetration,the empirical results show that the improvement of Internet penetration has played a positive role of bilateral service trade between China and the scale expansion and has heterogeneity characteristics among countries with different income levels and service industries.secondly,the Internet has reduced the number of service providers in China and other countries The cost of border trade and the increase of tradable degree make the scale of China's bilateral service trade expand.Taking the Internet as the entry point,this paper provides a new perspective for promoting the development of service trade.It has important policy implications for the new stage of China's open development of urgent needs to expand the opening of service industry and vigorous development in service trade.