Based on summarizing the former studies of theory and empirical ways to efficiency of M&A of banking, this paper choose Event Study to analyse the abnormal return of oversea M&A in China's bank at first. Then the paper uses Operating Performance Study (OP) to analyze the financial efficiency of the M&A. The results of two ways are similar, and the efficiency of the oversea M&A in sample banks isn't desirable.To explain the phenomenon, the paper point out four main factors affecting the efficiency of oversea M&A in china's bank:timing,scale,dealing approach and location. At last, this paper put forward some policy suggestions. |