Abstract: 【Purpose/significance】This paper analyzes the user knowledge interaction process in social Q&A communities and identify the key influencing factors in the user interaction process,in order to provide references for managers to optimize user experience and improve knowledge service levels.【Method/process】Based on the information ecological chain model of the social question and an⁃swer community,this paper uses questionnaire survey and interview methods to construct a system of influencing factors of user knowl⁃edge interaction behavior from the four dimensions of interaction subject,interaction content,interaction platform and interaction envi⁃ronment,and uses the DEMATEL method to identity the key factors【. Result/conclusion】According to the analysis of the correlation of
various factors,it is shown that experience perception,community atmosphere,self-efficacy,value cognition,and knowledge quality are the key influencing factors of the user's knowledge interaction behavior in the social Q&A community.Based on this,relevant sugges⁃tions on promoting community development were put forward【. Innovation/limitation】By using the DEMATEL method to systematically analyze the interaction between influencing factors of the knowledge interaction behavior in social Q&A communities,this paper ex⁃plores the key factors and put forward relevant suggestions for community development.But there are flaws in that the research data is subjective and lacks practical verification.