Based on the questionnaires of sports participation,social anxiety and positive psychological capital,the descriptive statistics,linear regression,and fixed-effects modeling were used to investigate the effect of psychological capital on college students'social anxiety,as well as to analyze the roles of different levels of sports participation on this effect.Methods:Using research methods such as literature review,questionnaire survey,and mathematical statistics,a questionnaire survey was conducted on 345 college students using the Interaction Anxiety Scale(IAS),Positive Psychological Capital Scale(PPQ),and Physical Activity Rating Scale(PARS-3).Empirical analysis was conducted on the impact of psychological capital on social anxiety among college students under the influence of sports participation.Conclusion:(1)The level of social anxiety in the male group was significantly lower than that in the female group(t =-4.201,P<0.01);(2)The level of social anxiety among college students majoring in sports is significantly lower than that of non-sports majors(t =-4.137,P<0.01);(3)There is a significant negative correlation between psychological capital and social anxiety(r=-0.497,P<0.01),and a negative correlation between sports activities and social anxiety(r =-0.290,P<0.01).Sports activities are positively correlated with psychological capital(r =0.238,P<0.01);(4)Both moderate and advanced levels of sports participation can promote the impact of positive psychological capital on social anxiety,but moderate levels of sports participation have the most significant impact.Suggestions:In the future,college students with different levels of sports participation can improve social anxiety by increasing different dimensions;For students who participate in lower and higher level sports,corresponding psychological capital interventions can be used to improve resilience and optimism;For students with moderate levels of sports participation,self-efficacy can be improved on the basis of enhancing resilience and optimism.