In recent years, under the attention of regulatory authorities at all levels, school sports have made significant progress and development, and the trend of declining student physical fitness has been basically curbed. However, the overall physical health of young students is still not optimistic, especially with high rates of obesity and myopia among children and adolescents. A series of policy documents such as "double reduction" have had a positive and important impact on school sports, especially extracurricular sports, and their spillover effects are becoming increasingly prominent. How to effectively solve the problem of youth sports through the "double reduction" policy is an important issue in current school sports. Providing good after-school physical education services is a key focus of the "double reduction" policy, which focuses on solving the problem of students being occupied by homework in their spare time, providing more opportunities for student sports activities. At the same time, it also faces challenges such as a shortage of human resources for after-school physical education services, unpaid or low remuneration for teachers. Therefore, increasing remuneration and fully mobilizing the enthusiasm and initiative of in-service teachers in schools to engage in physical education after-school services is the key to improving the quality of physical education after-school services. The establishment of student sports interest groups, sports clubs, sports clubs, and other organizations by schools is an important measure to alleviate the pressure of delayed physical education services after class. In addition, attracting outstanding athletes, coaches, retired teachers and other groups outside of school to participate in after-school sports services and providing corresponding compensation is also an important way to solve the problem. The government's purchase of services and the introduction of off campus training institutions is a new model to solve the shortage of human resources in after-school sports services. In recent years, some primary and secondary schools in provinces and cities have actively explored the introduction of off campus training institutions, vigorously promoting martial arts, Go, basketball, football, archery, swimming, roller skating and other projects, and have achieved good results. Many schools offer after-school services at 4:30 pm, where students can choose their own sports to meet their individual needs. This not only alleviates the shortage of teachers in schools, but also solves problems in physical education course management, venue, funding, space, and other aspects. Establishing an on campus and off campus competition system is a difficult task. Establishing an on campus and off campus sports competition system for all students is not only an important guarantee for implementing the concept of "teaching, diligent training, and regular competition" in youth sports, but also plays an important role in stimulating students' interest and enjoyment in sports. In recent years, many schools have focused on creating "one school, one product" and "one school, multiple products", providing a model for the construction of the school's sports competition system. Hangzhou Xiangshi Affiliated Primary School in Zhejiang Province takes basketball as its brand and creates a model of "having a team in each class, everyone can play basketball, and start practicing from the first grade". The school has provided 920 students with a basketball, which has improved their basketball level and the excellent rate of physical fitness tests. Huilongguan Central Primary School in Changping District, Beijing, takes football as a breakthrough point and builds a campus football competition system that "everyone plays football, there is a team in each class, football classes are held every week, football leagues are held every year, and everyone participates", laying a solid foundation for the development of school class and grade leagues. The construction of an on campus sports competition system should be tailored to local conditions and simplified according to local conditions. Based on the school venue, teaching staff, and other conditions, characteristic sports projects should be used as the starting point to carry out rich and colorful, small and diverse, and easy to operate competitions. On the other hand, the construction of an off campus sports competition system requires the joint efforts of the five main bodies of the country, province, city, county, and school to form a relatively complete variety of sports competition