RESUMEN
Objective To explore the influencing factors for usage of the official App of a hospital, based on Unified Theory of Acceptance and Use of Technology (UTAUT).Methods 616 outpatients were randomly sampled from outpatient clinics of three tertiary hospitals in Hangzhou for questionnaire survey, to learn the usage and intention for hospital′s official App.Results It was found that women (0.134), high performance expectancy (0.321), facilitating conditions (0.256), high effort expectancy (0.224), and desirable social influence (0.100) all contributed positive influence (P<0.05) to usage of such App.Conclusions It is recommended to enhance service functions of such App and simplify its usage, in addition to better promotion and online security measures.