Abstract: Objective To investigate the prevalence of obesity in children and adolescent aged 3-15 years in Henan Province and analyze its relationship with lifestyle. Methods Stratified cluster random sampling method was used to select children and adolescent aged 3-15 years in 10 cities of Henan Province. The descriptive analysis method was used to analyze the obesity rate among children of different ages and genders. Univariate and multivariate methods were used to analyze the relationship between childhood and adolescent obesity and related life behaviors. Results A total of 12 481 children and adolescent aged 3-15 years participated in the survey. The average age of the children and adolescent was （7.92±3.15） years. Among them, 1 407 were obese, with an incidence rate of 11.3%, including 12.9% for boys and 9.5% for girls. For the children and adolescent aged 9-12 years, the prevalence of obesity in boys was significantly higher than in girls （P＜0.05）. Breakfast at home （OR＝0.745） and higher frequency of physical exercise （OR＝0.522） were the protective factors of childhood and adolescent obesity. Conclusions The prevalence of obesity in children and adolescent aged 3-15 years in Henan Province is high. Prevention and control should be carried out before puberty, and the lifestyle of breakfast at home and regular physical exercise should be encouraged.

Key words: Childhood, Adolescent, Obesity, Prevalence, Life behavior