The project aims at developing the tailored intervention strategy of childhood obesity based on monitoring physical activities with accelerometer and dietary behaviors using diary. It probably raise the passion of obese children to control weight, form healthy life style, be effective in sustaining weight loss and early prevent adulthood diseases.

The overweight and obese primary school students from 1-5 grades will be recruited according to "Body Mass Index Reference for Screening Overweight and Obesity in Chinese School-age Children". The participants with will be allocated with schools as the unit to four groups: tailored intervention based on monitoring physical activity and dietary behaviors, exercise intervention group based on the Happy 10 program, nutrition education intervention group. The three intervention groups received the designed interventions for the duration of 1 year. Before and after the intervention, we will carry out a questionnaire survey, a physical measurement, a fitness test, and a metabolic markers detection

Inclusion Criteria:

• Overweight and obese children from grade 1-5 primary schools

Exclusion Criteria:

• Students with any contraindication or physical diseases (heart, Lung, liver, kidney, other vital organs, endocrine diseases and drug side effects et al.) and psychological illnesses that may prevent them from participating in physical activity and eating a normal diet were excluded