Abstract: Objective To investigate the prevalence and trend of change in overweight among adults in Liaoning province from 1991 to 2006. Methods The study was based on the data collected in China Health and Nutrition Survey in 1991,1993,2000,2004,and 2006 and the subjects were healthy adults. Results During the period of 1991-2006,the prevalence of overweight among the adults increased from 24.4% to 48.8%,with an increase rate of 100% and an accelerated increase rate.The prevalence of overweight was higher in the men than in the women and the difference in the prevalence between the men and the women decreased gradually.The subjects aged 18-30 years had the highest increase rate of overweight.Among the urban subjects,the men had a higher increase rate but the women had a higher increase rate among rural subjects. Conclusion The prevalence of overweight increased significantly with a 100% increment among the adults in Liaoning province from 1991-2006.