研究聚焦于社会支持对大学生运动动机影响效应分析，对社会主观支持、社会客观支持、社会支持利用程度对大学生各维度动机之间的关系进行梳理，对运动动机在社会支持与体力活动量的中介作用进行探析.主要采用文献资料法、问卷调查法、数理统计法对研究中的性别差异进行分析，采用相关性分析对社会支持各维度指标与大学生运动内部动机、外部动机、无动机进行指标相关验证，对不同维度动机模型进行社会支持回归分析，构建运动动机模型进行中介效应检验.研究发现：运动动机在大学生社会支持与体力活动之间存在中介效应；社会支持各维度对大学生运动动机有正向影响作用；大学男女生在社会支持获取与体力活动参与存在显著差异.

The study focuses on the analysis of the effect of social support on college students' exercise motivation， the relationship between social subjective support， social objective support， and the degree of utilization of social support on college students' dimensions of motivation is sorted out， and the mediating role of exercise motivation in the social support and the amount of physical activity is explored. In this paper， we mainly use the literature method， questionnaire survey method， mathematical statistics method to analyze the gender differences in the study， use correlation analysis to verify the index correlation between the indicators of the dimensions of social support and college students' internal motivation， external motivation， and no motivation in sports， conduct social support regression analysis on the model of the different dimensions of motivation， and construct a model of sports motivation for the mediating effect test. The study found that： exercise motivation has a mediating effect between college students' social support and physical activity； the dimensions of social support have a positive effect on college students' exercise motivation； and there is a significant difference between college male and female students' acquisition of social support and participation in physical activity.