This article will be divided into five parts to discuss the financial risks of M & A and its control measures. The first part is an introduction. Introduce from the research background, research purpose and significance, the current status of domestic and foreign research, and the research content and methods. The second part is the elaboration of concept theory. In this part, the concept of M & A, the concept, types and causes of M & A financial risk are introduced, which lays a theoretical foundation for the study of M & A risk in the following cases.