Abstract: M & A is essential for businesses. It is the business of a business strategy is the driving force of enterprise development, while expanding the business, a way to enhance the strength. M & A is a complex process that involves all aspects of business, every aspect of the enterprise it is very important in M & A, financial management runs through the entire acquisition process is the core and center, how to handle The financial integration is the key to the success of mergers and acquisitions, so we should pay attention to the financial effects of mergers and acquisitions. Key words: Mergers and acquisitions, positive and negative effects, financial risk