Abstract:Objective：To understand the characteristics of outpatient volume in a certain Grade-A Tertiary Children’sHospital from 2015 to 2019，so as to provide scientific basis for improving hospital management efficiency，optimizing service process and allocating medical resources reasonably. Methods：According to the time series analysis method and the seasonal index method，we analyzed the annual，quarterly and monthly changes of outpatient volume. Results：The number of outpatients increased year by year in recent five years，with an average growth rate of 108.22%. The seasonal index showed that February and December were the lowest（80.15%）and the highest（118.63%）of each year. The first quarter and the fourth quarter were the lowest（93.69%）and the highest（107.09%）respectively. Conclusion：The number of outpatients in the hospital has obvious seasonal and cyclical characteristics. It has a trough in the first quarter and a peak in the fourth quarter，and secondary peak in the summer vacation time. Hospital managers should reasonably allocate medical resources according to the characteristics，take off peak vacations and arrange shifts flexibly，make real-time monitoring and emergency plans during peak periods，expand service forms in trough periods，and to meet the needs of patients better.