Clarifying the influencing factors of patient users' medical choice behavior is the key to improving patient users' online medical experience. Taking Haodafu psychiatric patients as the research object, based on the perspective of ELM-SOR theory,a model of influencing factors of patient users' online medical choice behavior is constructed, and a combination of structural equation model and fuzzy set qualitative comparative analysis is used method for analysis. The results show that: ①The medical choice behavior of patients in online health community is affected by the information quality of the central route, the reputation and credibility of the peripheral route and other factors, this process will also be regulated by the patient's user involvement and consultation price.②Qualitative comparative analysis of fuzzy sets found four antecedent configurations that trigger the transformation of online medical choice behavior. The findings provide recommendations for optimizing the online consultation experience.