With the development of mobile communication technology and the popularization of smartphones, social media has become part of the daily study and life of dance majors and always affects their academic performance. Taking dance majors in a university as the research object, the article selects the variables related to trust intensity and academic performance in social media interaction of dance majors and constructs a multi-period mixed cross-section DID model. On this basis, the variables were analyzed with descriptive statistics, and the effect of trust intensity in social media interaction on students’ academic performance was analyzed based on the DID (double difference) model. Finally, placebo test and robustness test were conducted for the regression results to analyze the heterogeneity. The baseline regression analysis showed that the trust intensity of social media interactions has a significant effect on academic performance, and the higher the trust intensity in social media interactions, the more likely it is to lead to good academic performance, meanwhile, competence trust is a direct, effective and stable predictor of academic performance, and among all the variables, reliability trust has the greatest effect on academic performance.
