以CEPS数据为基础，采用多层线性模型（HLM），在对个体、家庭和学校等多层特征进行控制基础上探讨青少年课外体育运动对学业成绩的影响。研究发现：青少年每天参与课外体育运动时间控制在60分钟内对学业成绩提升具有显著正向影响、在60-120分钟内影响不显著、超过120分钟对学业成绩提升具有显著负向影响；课外体育运动对数学等理科成绩影响幅度大于对语文和英语等文科成绩的影响幅度；在控制学校层面差异后，课外体育运动对学业成绩影响幅度有所增强；非认知能力不仅对学业成绩产生直接正向影响，而且能在课外体育与学业成绩提升之间产生显著中介效应，其中环境适应能力中介效应最大，其次是自我效能感、自我控制能力和情绪调节能力。

Based on CEPS data, this paper uses multi-level linear model (HLM) to explore the influence of extracurricular sports on academic performance of teenagers on the basis of controlling multi-level characteristics of individuals, families and schools. The results show that: the time control of extracurricular sports activities within 60 minutes has a significant positive impact on the improvement of academic performance, while the influence is not significant within 60-120 minutes, and has a significant negative impact on the improvement of academic performance; the influence of extracurricular sports on the performance of science such as mathematics is greater than that of arts such as Chinese and English After school level differences, the influence of extracurricular sports on academic performance has increased; non-cognitive skills not only has a direct positive impact on academic performance, but also has a significant mediating effect between extracurricular physical education and academic performance improvement. Among them, the mediating effect of environmental adaptation is the largest, followed by self-efficacy, self-regulation ability and emotional regulation effect.