In recent years, with the continuous development of E-commerce, the third-party online payment pattern is gaining increasingly popularity among users. Characterized by its convenience, high-credibility and safety, it has become the mainstream pattern of online payment. With its rapid development, the third-party online payment has drawn more and more attention among people from all circles. And the focus of the attention is on the risks of using this platform. In this paper, the author introduces the present development status of the third-party online payment. On the basis of that, the paper focuses on the risk analysis and supervision in the process of operation by employing scenario analysis and list technique. In order to prevent and control risks in the third-party online payment, we should study the third-party online payment market thoroughly and take all aspects into consideration. It will shape a healthy and stable development trend only when all parties related work cooperatively.