Objective To investigate the current prevalence and risk factors of obesity and hypertension among children and adolescents in Hengli town,Dongguan city. Methods Using cluster sampling,9 651 children and adolescents aged 3～17 years old in Hengli town,Dongguan city were required to finish a questionnaire survey.Anthropometric measurements including height,weight,waist circumference and blood pressure were performed. Results The detection rates of overweight,obesity and central obesity,which were 12.0%,4.1% and 6.8% respectively,were 8.9% vs 16.2%,5.0% vs 3.1% and 7.2% vs 6.2% respectively when compared between males and females.The difference of sexes was statistically significant (P＜0.001).The detection rate of hypertension was 4.4%,which increased with age and was lower in males than in females (3.8% vs 5.1%,P=0.002).Multifactor Logistic regression analysis revealed:previous macrosomia and obese parents were the risk factors of obesity for children aged 3～6 years old,for whom overweight,obesity and central obesity were the risk factors of hypertension.Male,7～12 yearold,previous macrosomia,obese parents,rapidly feeding and inadequate or over sleeping time were the risk factors of obesity for children aged 7～17 years old,for whom female,13～17 yearold,low birth weight,parents with hypertension,overweight and obesity were the risk factors of hypertension. Conclusions The detection rates of overweight,obesity and central obesity in children and adolescents aged 3～17 years old in Hengli town,Dongguan city are lower than those in developed metropolitan city.The detection rates of hypertension are in the range of intermediate level.The risk factors of obesity and hypertension between 3～6 yearold children and 7～17 year old children and adolescents are different in some aspects.