Abstract: Objective Through regulatory study on the common defects of air purification system, this paper provides valuable reference for practitioners in medical device industry. Methods More than 100 verification results of different companies had been collected during 2015 to 2018, followed by systematically analysis of the defects related to air purification system. Result 70 types of common defects in 13 areas had been summarized, and 20 key points in verification had been briefly concluded. Conclusion Recognizing and understanding these summarized defects and key points will not only promote the unification of criterion scale, but also benefit enterprises for themselves, inspection, quality management improvement, and the plant transformation as well.