Abstract:Objective：To understand the situation and reasons of outpatient withdrawal，and explore the effective strategies for improving outpatient service. Methods：Collect the data of registration and withdrawal in a single district of a certain public hospital from January 2019 to June 2022，compare the differences of registration withdrawal rates among different specialties，registration types，treatment methods and dates. And we collect the data of the reasons for withdrawal through questionnaires，to monitor the changes in the composition of the reasons and the effectiveness of the improvement strategy of outpatient service. Results：The overall withdrawal rate decreased from 4.25% in 2019 to 2.25% in 2022. The withdrawal rate on weekends（>4%）was significantly higher than that on weekdays（all<3.6%）. The withdrawal rate from high to low is surgery（6.96%），pediatrics（5.31%），internal medicine（3.95%）and obstetrics and gynecology（3.04%）. The main reasons for withdrawal are wrong registration，repeated registration，personal reasons of patients，and long waiting time，which have been significantly improved after implementing improvement measures. Conclusion：Through the analysis of the reasons for the withdrawal，we can trace back the problems and deficiencies of the outpatient service，andcontinue to strengthen the system management，improve the diagnosis and treatment process，strengthen the supervision and assessment，to create a more high-quality and convenient outpatient environment.