Objective To explore the relationship among regulatory emotional self-efficacy,Internet overuse and personality,in order to provide the basis for reducing the incidence of Internet overuse and formulating relevant intervention.Methods Bv cluster sampling method,a questionnaire survey was conducted among 1750 students in a university.Results There was a statistically significant difference in gender(t=5.47,P＜0.05) and grades(F=6.11,P＜ 0.05) of Internet overuse.The rate of college students' Internet overuse was 19.92％.The scores of personality of intelligence,stability,perseverance,boldness,sophistication and self-discipline in Internet overuse group were lower than the normal use group(t=1.73-6.01,P＜0.05),but the scores of dimensions of aggressiveness,suspicion,anxiety and tension were higher(t=-7.74--2.61,P＜0.05).The total scores of regulatory emotional self-efficacy were lower in Internet overuse group(t=5.538,P＜0.05).There was a significant negative correlation between the scores of Internet overuse and the scores of regulatory emotional self-efficacy(P＜0.05).The scores of Internet overuse were significant positive correlation with suspicion,anxiety and tension,but significant negative correlation with stability,excitability,perseverance,boldness and self-discipline (P＜0.05).There was a significant positive correlation between the scores of regulatory emotional self-efficacy and intelligence,stability,dimensions of aggressiveness,excitement,perseverance,boldness and self-discipline of personality,but significant negative correlation with suspicion,anxiety and tension(P＜0.05).Regulatory emotional self-efficacy played a partial mediating role in Internet overuse and personalitv traits,the rate respectively was 30.8％,16.7％,14.5％,37.3％.Conclusion There were a closely relationship among regulatory emotional self-efficacy,Internet overuse and personality.Regulatory emotional self-efficacy played a partial neliating role in Intemet overuse and personality traits.