Based on the data of sports activities situation survey of children and adolescents from age 6 to 19 throughout the country in the study of national fitness activities in the year of 2015，53401 adolescents，divided into four age groups，from 6-9，10-12，13-15，16-19 years of age，received the research on PE class，in-class and out-of-class sport activity organization，participation，facilities and the efficiency of organization. The rate of children and adolescents who exercised once or more in a week is 99.3%，however，times would come down with the growth of age；Those who had 2 or 3 P.E. classes every week enjoyed the highest rate；As for exercise out of school，most of them chose to do about 30 to 59 minutes at a time；P.E. class was the main approach to sports activities for children and adolescents，which contained the moderate intensity，and most of them had it in 2 days of a week；Most of them had extracurricular activities in 2 days every week；The highest rate of students was that of those who participate in sports activities out of school in 2 days every week；There is an increasing Children and adolescents’ demand for ball games with the growth of age；The form of organization of after-school sports was that friends classmates or colleagues participated spontaneously；And the places where they did exercise out of school were always stadiums or gymnasiums；The main factor why these adolescents did sports was that exercise could build their bodies and gave them too much fun and they were fond of it；And those who refused to do so said that it would interfere with their study. What’s more，the study makes policy suggestions for the development of sport activities among children and adolescents of our country.