Online car hailing platform is an important part of platform economy. With the rapid development of online car hailing platforms，online taxi，an emerging way of travel，has profoundly changed people’s living habits. In the fierce competition among various online car hailing platform companies，Didi Travel finally stood out and successfully occupied the largest market share. This report selects Didi as a representative enterprise in the industry. Firstly，it combs the development process，operation status，operation mode and platform characteristics of Didi，and summarizes the advantages of Didi in information sharing，resource integration and technological innovation；Secondly，it analyzes the problems of Didi from four aspects：privacy disclosure，data ethics，enterprise monopoly and platform governance failure，and puts forward countermeasures and suggestions to solve various problems and promote the healthy development of the platform；Finally，it looks forward to the future development direction of online car Hailing platform from the perspective of Didi.