Abstract:Objective：To code and analyze the outpatient complaints based on the framework of Health Catalyst（HCAT），and to provide the basis for improving the quality and satisfaction of outpatient service. Methods：The outpatient complaints of in certaingrade-A tertiary hospital from January to December of 2020 were coded and analyzed based on the HCAT framework，according to the basic information，problem categories，severity，the stages of care，and the level of harm. Results：174 cases of outpatient complaints were coded and analyzed. Relationship problemswere the main problem domain.Clinical departments were the major departments where complaints occurring. Doctorswere themain staff group referred to. The severity of complaintswas mainly mild.Admissions，examination and diagnosis stageswere high incidence stages of complaints. Most of the complaints did no obvious harm to patients. Conclusion：Outpatient complaints can be scientifically categorized and analyzed by using HCAT framework，which is beneficial for management.