With the development of the Internet, the application of big data technology and AI algorithm technology has become more and more popular. The application of big data in marketing is also more and more extensive. For example, 1. the analysis of individual user characteristics and behavior, for example, MobTech enterprise covers 13.8 billion + devices, own data is huge, the use of their own data and first-party data matching, to help enterprises to do accurate user profiles and labels to supplement the data analysis, and then through the data analysis of advertising and marketing information accurate push, now RTB advertising and other applications show us better than before the accuracy of the Nowadays, RTB ads and other applications show us better precision than before, which is supported by big data, and MobTech's user labels have reached 6000+ dimensions, covering gender, age, income level estimation, consumption tendency, media usage tendency, etc., which describes the user's data in various dimensions in a refined way. Through precise marketing can improve the effectiveness of the placement, help enterprises to reduce costs and increase efficiency.