Abstract: 【Purpose/significance】False information problems of new media environment to the elderly into the media society brought huge obstacles, analysis of the key factors, to optimize the social media platform operation management and promote the elderly into the media society has certain reference role【. Method/process】Based on the semi-structured interview, the influence factor model of the elderly was constructed according to the three-level coding process of Grounded Theory, and clarify the influence relationship be⁃ tween factors and quantify the weight of key influencing factors【. Result/conclusion】Combined with the limit supermatrix of influenc⁃ ing factors, the degree of influence factors and the degree of cause factors, and puts forward corresponding coping strategies【. Innova⁃ tion/ limitation】With the help of rooted theory, this paper constructs a model of the influencing factors of online false information iden⁃ tification behavior of the elderly group and uses the fuzzy DANP method to identify the key influencing factors, which can provide some reference and enlightenment for the service optimization of related platforms. Follow-up studies expect to select specific social media platforms or refine specific research situations for a more in-depth discussion.