Through the paper, we find that from an over perspective, hiring the matching accounting firm can control the M&A risk and improve the M&A performance effectively. And to be specific, firstly whether the local M&A or cross regional M&A, the local accounting firms can improve the performance more significantly depended on their obvious location advantage. Secondly, with the potential advantages such as information distance, relationship resources and affective commitment etc, the related accounting firms can provide higher quality services, especially related firms of the target enterprise. Finally, the accounting firm reputation is not the absolutely effective hiring criteria, and the company need to pay more attention to the accounting firm practice experience and internal control validity.