Objective To explore the relationships between serum levels of adiponectin and essential hypertension in the people with overweight and obesity.Methods The body mass index(BMI),waist circumference(WC),waist-hip ratio(WHR) and blood pressure(BP) were measured among 21578 people from 21 to 60 years old in Shenzhen.According to BMI,the people were divided into the normal-weight group(BMI≤24kg/m~2)(n=14817),the overweight group(2495 cm,respectively(all P0.05).The serum levels of adiponectin were negatively correlated with BMI,WC,WHR and systolic blood pressure in the hypertension obesity cases.Conclusion Adiponectin may be intimately related to obesity and essential hypertension.Keeping the BMI and WC at normal range is one of the effective ways to prevent the risk of essential hypertension.