Objective To investigate the relationship between obesity and blood pressure in children and adolescents in order to provide evidence for early prevention and intervention for the cardiovascular disease. Method 4 841 7~17 year old children and adolescents were selected in Qingdao from National Student Physical Fitness and Health survey in 2010,for the study.We used the chi-square test,standard deviation method and multivariate logistic regression analysis for analysis according to overweight and obesity screening standards and blood pressure reference standard of children and adolescent in China. Results Overweight and obesity detection rate of 7~17 year old students in Qingdao was 15.37% and 11.59%,respectively.Rate of boys was higher than girls.High blood pressure detection rate was 30.4%,and the rate of boys was higher than girls.The rate in urban was higher than in rural.Blood pressure Z-score in descending order were obese group,overweight,normal weight group.BMI in the high blood pressure group 20.58±4.42 was higher than the normal group 18.85±3.47.Multivariate analysis showed that urban and rural areas,gender,age and BMI were the influencing factors of blood pressure. Conclusion High blood pressure detection rate in Qingdao was higher than which in Shandong province.Older urban obese boys had high probability of hypertension occurrence.