Abstract: 【Purpose/significance】Exploring the antecedents and their working mechanism of physicians' knowledge contribution be‐
haviors in online health communities is of great significance to improve their knowledge contribution intentions,bridge the gap between intentions and behaviors,and promote physicians to make knowledge contributions【. Method/process】Taking physicians in the online health community as the research object,this research constructed a theoretical model based on the health action process approach theory (HAPA) both structural equation model (SEM) and the fuzzy set qualitative comparative analysis (fsQCA) were applied to ex‐plore the influencing factors of physicians’knowledge contribution behavior【. Result/conclusion】①In motivation phase,self-efficacy,responsibility and action control positively affected the knowledge contribution intention; in volitional phase,coping plan,action control,and knowledge contribution intention positively affected the knowledge contribution behavior; the coping plan exercised a mediating ef‐fect between knowledge contribution intention and behavior.② Qualitative comparative analysis found three types of antecedent con‐figurations that triggered knowledge contribution intentions and knowledge contribution behaviors respectively. Self-efficacy, action control and knowledge contribution intention played important roles in knowledge contribution【. Innovation/limitation】The research in‐troduced the theory in the health field into knowledge contribution,and combined the occupational characteristics of physicians to in‐troduce the corresponding variables,and used a hybrid method to discuss the complex causal relationship between multiple variables but sample data may have homologous variance.