Objective To explore the application effect of hospital customer service system under the "four in one" model.Methods: A total of 300 outpatients served in the pilot departments of Huizhou Third People''s Hospital from July 2020 to June 2021 were selected as the control group, and the general customer service model intervention was given.A total of 300 outpatients served from July 2021 to June 2022 were selected as the observation group, and the "four in one" customer service model intervention was given.The satisfaction, recognition, convenience of the two groups were compared. Results: In comparision of the control group (88.67%), the satisfaction of the observation group (96.00%) was higher (P<0.05).In comparision of the control group, the recognition of the observation group was higher (P<0.05).In comparision of the control group(90.33%), the convenience of the observation group (96.67%) was higher (P<0.05).Conclusion: The hospital customer service system under the "four in one" model can improve patient satisfaction, recognition and convenience.