In this study, 349 college students were selected to explore the relationship between the useof passive social networking sites, social anxiety and loneliness, and the mediating role of social anxietybetween them. After data collection, processing and analysis, the following conclusions are drawn:(1) There is no difference in loneliness between the only child and family location, and there is differencein gender and grade. (2) There is a positive correlation between passive social website use and socialanxiety; there is a negative correlation between passive social website use and loneliness; there is a positivecorrelation between social anxiety and loneliness. (3)The prediction effect of passive social website use onreal social anxiety is positive; the prediction effect of passive social website use on loneliness is negative;the social anxiety dimension of social anxiety can positively predict the level of loneliness; real socialanxiety may have a masking effect in passive social website use and loneliness.