目的　了解南海市南庄镇和小塘镇人群龋病流行病学状况 ,作为制订防龋计划的依据和防龋项目评价的基线资料。方法　按照第二次全国口腔健康流行病学调查标准 ,对两镇 3～ 74岁人群进行龋病流行病学抽样调查。结果　 5岁组乳牙龋均为 3.5 85 (南庄 )和 5 .2 39(小塘 ) ;10岁组恒牙龋均为 1.196 (南庄 )和 1.4 38(小塘 ) ;在年龄较大的人群两镇患龋情况差别不大 ,在青少年中患龋情况小塘镇高于南庄镇。结论　①南海市小塘镇和南庄镇人群龋病情况均符合全身用氟项目的试点研究的条件 ;②两镇龋病状况处于低等级水平 ,与广东省患龋水平接近 ,高于全国平均水平 ;③两镇患龋情况在青少年中小塘镇稍高于南庄镇 Objective To understand the prevalence of dental caries in Nanzhuang Town and Xiaotang Town, Nanhai City as the basis for formulating the anti-caries program and the baseline data for the evaluation of caries prevention projects. Methods According to the Second National Oral Health Epidemiological Survey, a dental caries epidemiological sampling survey was conducted among 3 ~ 74-year-olds in both towns. Results The caries of deciduous teeth of 5-year-old group was 3.585 (Nanzhuang) and 52.29 (Xiaotang) respectively. The permanent caries of 10-year-old group was 1.196 (Nanzhuang) and 1.4 38 (Xiaotang) Town suffering from caries little difference in the situation of teenage caries Xiaotang town higher than the town of Nanzhuang. Conclusion ① The caries status of Xiaotang and Nanzhuang populations in Nanhai are in line with the pilot study of fluoride in the whole body. ② The caries status of the two towns are in a low level and close to the caries prevalence level in Guangdong and higher than the national average ; ③ caries in two towns in the town of young slightly higher than the town of Nanzhuang