Purpose/Significance The online health community provides a new channel for communication and interaction between patients and doctors. To study the influencing factors of patients’ choice of doctors has practical significance for improving patient decision-making efficiency, motivating doctors to improve services, and maintaining the healthy development of online health community.Method/Process Based on trust theory, perceived value theory and other theories, the hypothesis of influencing factors of patients’ medical choice behavior is put forward and a research model is constructed. Web crawler tools are used to collect relevant information about doctors provided by online health community, and regression analysis is used to test the hypothesis.Result/Conclusion Patients’ medical choice behavior is influenced by group size, online reputation, functional value, etc., and online trust plays a mediating role in the impact of the above factors on patients’ medical choice behavior. The study provides references for patients’ medical choice, doctors’ improvement of their own service level, and platform optimization of doctor evaluation mechanisms.