Abstract: Objective To estimate the prevalence of overweight and obesity, and their relationship between overweight, obesity and chronic diseases among adults in Pinghu City.Methods A total of 3 106 local registered permanent residents aged above 18 years were selected by multi-stage random sampling and questionnaire surveys were conducted. The blood glucose, blood lipid, blood pressure, height and weight of the participants were tested.Results The prevalence rate of overweight was 31.6% (the standardized rate was 29.5%) and the prevalence rate of obesity was 8.1% (the standardized rate is 7.8%) in residents aged above 18 years in Pinghu City. The prevalence rate of overweight and obesity was highest among population aged from 50 to 59 years. The prevalence rates of overweight of the population in different ages and with different education backgrounds had significant differences(P<0.05). The prevalence rates of diabetes, hypertension and dyslipidemia among overweight and obese population were higher than those with normal weight (P< 0.01). BMI was the risk factor of hypertension, diabetes mellitus and dyslipidemia, and the OR value was 1.508, 2.127 and 1.571, respectively.Conclusion The prevalence of overweight and obesity in Pinghu City is serious and has close relation with chronic diseases. Prevention and intervention measures are necessary for the overweight and obesity population.