Abstract: 【Purpose/significance】Exploring the user information interaction behavior of AIGC Q&A platform is of great significance to broaden the research system of AIGC Q&A platform and improve the user service quality of AIGC Q&A platform.【Method/process】 Based on the information ecology theory, we constructed a model of factors influencing the user information interaction behavior of AIGC Q&A platform. A mixed method of structural equation modelling and fuzzy set qualitative comparative analysis is used to carry out empirical research.【Result/conclusion】(1) Information usefulness, information ease of use, perceived fun, technology facilitation, interaction atmosphere and interaction willingness are the key factors influencing the information interaction behavior of AIGC Q&A platform users, while the willingness of AIGC Q&A platform users to interact with each other tends to act as a mediator variable influ⁃ encing interaction behavior. (2) Information usefulness and information ease of use are important conditions for the emergence of infor⁃ mation interaction behaviors, and information ease of use and willingness to engage in information interaction behaviors constitute a combination of the necessary conditions of the classical grouping paths, and together with the combination of other variables, they jointly promote the emergence of information interaction behaviors.【Innovation/limitation】Classical theories are integrated into the study of AIGC, an emerging technology and interaction model. A mixed empirical approach is used to discuss the multiple and com⁃ plex causal relationships, and more in-depth research should be carried out in the future to address the theoretical issues such as the mechanism of information interaction of platform users.