This study explores whether the payment methods of M A of merger companies have differences in the post-merger performance of companies, and whether the payment methods of M A of merger companies affect external investors.The empirical results show that when the return on equity (ROE) is used as a variable to measure M A performance, cash payment and stock payment are both negative and insignificant in the first year after M A. The impact on performance is positively correlated, while stock payments are negatively correlated with performance in the second and third years post-merger. The empirical results found that there is a positive effect between cash payments and stock returns, while there is a negative effect between stock payments and stock returns.