Abstract: Objective To evaluate overall physical activity level and influence factors of Chinese children and youth,and provide reference for improvement of physical activity level and fitness.Methods Data quoted from "Report of 6-69-year-olds Physical Activity investigation and Physical Fitness sampling tests in China(2014)",relevant physical activity data were processed by SPSS 20.0,descriptive statistics and logistic stepwise analysis were adopted.Results Only 8.9% of children and youth reach recommended amounts of physical activity,due to high participation (99.8%) but low intensity(nearly 1/4 didn't reach moderate intensity).Extracurricular(OR=6.57,95%CI=5.58-7.73),off-school physical activity (OR=6.11,95%CI=5.17-7.22) and PE class (OR=5.32,95%CI=4.49-6.31) accounted for qualified rate of PA guideline.While active play and school commute participation of organized sport club shown lower contribution on PA level.Doing homework ≥ 2 hours/day was negatively related to PA level(OR=0.59,95%CI=0.44-0.80).Parents' support and teachers' instruction or coaching were protective factors of overall physical activity level,while unitary sports facilities and low utilization rate were limitation.Conclusion Children and youth are severely inactive in phyisical activity in China.Multi-angle guidance and promotions were required on participation in physical activity.Strengthening effective physical exercise and reducing sedentary time should be key contents to improve overall physical activity level of children and youth.