In recent years, with the general strengthening of China's national strength, mergers and acquisitions have become more frequent. Mergers and acquisitions can strengthen a company's strength and achieve maximum value big. Mergers and acquisitions are complex economic activities with many interests that can involve some financial risks. Therefore, preventing financial risks has become a challenge for companies. Key factors for successful mergers and acquisitions. This article analyses various risks and their causes in the process of mergers and acquisitions and proposes some control measures.