PDCA cycle, also called pdsa, was put forward by Dr. Deming, an American quality management expert. It is a scientific procedure that should be followed in total quality management. The whole process of total quality management activities is the process of making and organizing the quality plan, which runs endlessly according to PDCA cycle. PDCA cycle PDCA cycle is a logical working procedure that can make any activity effectively, especially in quality management. The English letters P, D, C and A have the following meanings: ① P (plan)-plan. Including the determination of policies and objectives and the formulation of activity plans; ② d (do)-execution. Execution is the concrete operation to realize the contents in the plan; ③ c (check)-check. It is to summarize the results of the implementation plan, distinguish which ones are right and which ones are wrong, clarify the effect and find out the problems; ④ A (act)-Action (or treatment). Deal with the results of the summary inspection, affirm the successful experience and standardize it, or formulate work instructions to facilitate future work; We should also sum up the lessons of failure so as not to repeat them. The unsolved problems should be referred to the next PDCA cycle to solve. PDCA is the first letter of English words: Plan, Do, Check and Act. PDCA cycle is a scientific procedure that carries out quality management in this order and goes on endlessly.