Abstract: Objective To understand the diet,exercise and weight control behaviors of adole scents in Xicheng district of Beijing,and to provide evidence for school health education and promotion.Methods A risk behaviors questionnaire survey was conducted among 2 007 students selected from 9 middle schools.Results The proportions of having soft drinks,eating sweet food,having we stern-style fast food and eating fried food frequently were 31.4%,31.04%,6.93%,and 7.47%,respectively.41.49% of the students was used to choose specific food;61.04% drank milk frequently;73.32% had breakfast every day.The proportions of participating daily physical exercises,mode rate intensity physical exercises and walking or riding fora time of 30 minutes or more continuously were 60.46%,47.11%,and 56.60%,respectively.The proportions of watching TV/video,doing homework,playing electronic games,and using internet more than two hours per day were 28.59%,68.57%,21.39%,and 21.27%,respectively.43.00% of the students thought they were overwe iht and 76.08% took measures to lose weight.1.39% of the students had vomitting;3.71% had history of fasting;1.97% had history of taking pill,powders or liquids to lose weight.Conclusion Nutrition education should be taken and physical exercise,healthy diet and exercise behaviors should be promoted among middle school students.