Objective To investigate the prevalence of overweight,obesity and hypertension among preschool children in Jing′an district of Shanghai,in order to provide evidence for relevant intervention measures. Methods A total of 3 608 preschool children aged 3~7 who took physical examination in kindergartens in Shanghai Jing ′an district in 2017 were selected as participants in this study.Data were analyzed by SPSS 24.0 with the reference of World Health Organization (WHO) child growth standards and blood pressure reference standard of children and adolescent in China. Results The overweight and obesity detection rate of 3 to 7-year-old preschool children in Shanghai Jing ′an district was 9.3% and 9.2%,respectively.The obesity rate of boys was higher than that of girls,and the rates of overweight and obesity of 6 to 7-year-old children was significantly higher than those in other age groups (P<0.05).However,there were no significant differences on the detection rate of overweight between boys and girls(P＞0.05).The overall rate of hypertension was 1.5%,which was significantly higher in boys and obese children than that in girls and children with overweight and normal weight (P< 0.001).But the differences on hypertension detection rates among different age groups were not significant (P＞0.05). Conclusion The rate of overweight,obesity among preschool children in Jing′an district of Shanghai is quite high,prevention of related chronic diseases should be carried out early in preschool children