There are more than 600 million Douyin users, an increase of 6% compared to the previous year. With more than 800 million daily active users, Douyin has become one of the most popular short video and e-commerce platforms in China. Within this context, this paper takes Douyin as an example to study how e-commerce can quickly transform user traffic into profit. Moreover, it adopts a comparative method to uncover the difference in e-commerce between China and foreign countries. The research finds that the way, background, and resources of online sales in China are generally different from those in foreign countries. E-commerce on Douyin is more convenient and mature. By integrating the sales strategies of domestic and foreign e-commerce, this research is conducive to the development of transnational e-commerce.