[Purpose/significance] Information privacy concerns are an important topic in the information behavior of social media users. The article aims to explore the factors that influence the privacy concerns of social media users.[Method/process] Based on theories of multi-dimensional development, protection motivation, media contact, this article puts forward the influencing factors of social media users' information privacy concerns and constructs hypotheses of influencing factors. We took social media users as the research object and obtained 378 valid questionnaires. Logistic regression analysis method is used to filter the influencing factors of social media users' information privacy concerns, and then the ISM is used to further analyze the relationship and the overall hierarchical structure between the factors. [Result/conclusion] The study found that among the influencing factors of social media users’information privacy concerns, age, information privacy violation experience, and purposeful demand motivation are the deep root factors,and information disclosure willingness, information privacy knowledge understanding, and information privacy policy awareness are middle-level indirect factors , information privacy protection, self-efficacy, fairness perception and service quality are superficial direct factors. The article explores the influencing factors and mechanism of social media users’information privacy concerns, and provides a reference for social media to effectively reduce users’information privacy concerns.