In the era of internet knowledge economy, online knowledge payment platform has been highly concerned by users because it can help users solve knowledge anxiety caused by knowledge overload. This paper summarizes the current situation of user online knowledge payment research both in domestic and foreign study, and analyzes the achievements and shortcomings of user online knowledge payment research, which shows that the existing research on the types and ways of users'online knowledge payment are relatively deficient. Suggestions and prospects are put forward for future research in this paper. It also indicates that the further study can be conducted based on the participants' perspectives who involved in online knowledge payment platform and that the topic can be discussed in related issues in depth, including the user perspective, platform perspective, knowledge supplier's perspective and relationship perspective.