Abstract:Objective：The purpose of this article is to introduce the beneficial exploration and practical experience of a certain grade A tertiary hospital in introducing an internal audit mechanism in hospital evaluation，and to provide reference for other medical institutions to implement normalized evaluation work. Method：Summarize the operation mode of internal audit mechanism in the evaluation of graded hospitals，elaborate on the specific application of internal audit mechanism in evaluation practice，and compare the quality improvement before and after the application of internal audit mechanism. Results：After applying the hospital internal audit mechanism，a fundamental transformation from temporary to normalized was achieved. This not only solidified the foundation of hospital basic management，but also significantly promoted the improvement of medical quality and service level，as well as hospital management efficiency. The problems were effectively implemented and rectified，and ultimately the hospital passed the three-level hospital review smoothly. Conclusion：Establishing and operating a hospital internal audit mechanism can facilitate the development of hospital evaluation work，effectively promote the transformation of work from passive evaluation to active internal audit，improve hospital management level，and promote continuous quality improvement.