Abstract: This paper analyzes the policies, regulations and specific strategies of Japan to improve the physical and mental health of adolescents in recent years, such as legislating for schools to strengthen physical education, revising "Essential Guidelines for Learning" of primary and secondary schools to improve physical education, strengthening the cooperation between school and society, selecting specific strategies according to physical fitness research and so on.Therefore the study raised the following strategies to cope with the decline in physical fitness of adolescents in our country:to elevate the policies and regulations of physical education at school to the height of national legislation, to entitle necessary legal effects to the curriculum standards, to set up a relevant supporting system to promote school and social cooperation, to improve the physical research so as to play a instructing and leading role.