Based on the behavior occurred during the merger as a logical basis for the recent national study systematically comb. The study found： studies mainly focus on the pre-merger acquisition of motivation， the timing of merger and acquisition target selection carried out in three areas； acquisition process research is focused on the acquisition payment， merger negotiation process and transaction risk decision-making and acquisition process； while acquisitions after the study， the research focused on influencing factors of integration and acquisition performance after the merger. Mergers and acquisitions in China generally poor performance， especially overseas mergers and acquisitions success rate is not high， future research should strengthen the influence of multiple aspects of M & A performance prior acquisitions， and to explore how scientific decision occurred before the merger， including the right target selection， due diligence surveys and enhance bargaining power， such as to improve the success rate of mergers and acquisitions as well as mergers and acquisitions to enhance performance.