采用ＷＨＯ龋病调查标准对南通市区１２４１５名７～１２岁学龄期儿童进行了患龋病情况的调查。龋病总发病率为６７．２３％，男、女发病率分别为６６．４４％、６８．０３％，差异无显著性（Ｐ＞０．０５）。７～８岁组患龋病率最高（８６．０８％），与９～１０岁组、１１～１２岁组比较差异有高度显著性（Ｐ＜０．０１）。学龄期儿童是人群龋病发病率最高年龄段，应在学龄期前即开始进行口腔保健 The prevalence of dental caries in 12415 school-age children aged 7-12 years in Nantong City was investigated by the WHO caries survey. The total incidence of dental caries was 67.23%, the incidence of male and female were 66.44% and 68.03% respectively, with no significant difference (P> 0.05). The prevalence of dental caries in the 7-8 years old group was the highest (86.08%), which was significantly higher than that in the 9-10 years old group and the 11-12 years old group (P <0.01). School-age children is the highest incidence of dental caries in the population, should be carried out before school age oral health