In recent years, the phenomenon of less child has gradually impacted the development of school education. School Physical Education for the country to develop the basis of competitive sports, the reduction in the number of students, also for the development of sports schools have a considerable impact on the impact. Therefore, this study mainly discusses the influence of the phenomenon of less child on the development of school sports, the influence level of national primary education promotion, and draws the strategic direction. This study explores the causes of the phenomenon of less child by the relevant literature, which is divided into three main points: one, the phenomenon of unmarried and late marriage infertility; Second, the social environment economic pressure; Third, the policy and the concept of influence. And then to explore the current school sports development faced by the dilemma, student factors, parents factors, coaching factors and schools and venues equipment and other four structural analysis and discussion, and give the strategy recommendations.