Objective To understand the status of height and weight of urban school-age children in Yiwu,investigate the incidence of overweight,obesity and short stature,and to provide the clues for early intervention of children. Methods Totally 2 069 school-age children were selected from urban area of Yiwu city.Data of height and weight were collected and body mass index was calculated.Using the survey data of children's physical development in nine provinces and municipalities in 2005 as a standard,the prevalences of overweight,obesity and short stature were calculated and analyzed. Results 1) The height and weight levels of boys and girls in 6.0~6.5 and 8~11.5 groups were all higher than the national levels.2)The prevalence of overweight and obesity was 10.68% and 14.16% respectively (11.27% and 14.77% for boys,9.91% and 13.36% for girls).3)The total prevalence of short stature was 2.80%( 2.73% for boys and 2.90% for girls). Conclusions The prevalence of obesity is high.The prevalence of short stature is lower than the national level.The situation of childhood overweight and obesity becomes more serious,and the short stature problem can not be ignored,they all deserve timely and effective interventions.