为了解和总结广东省改水对地方性氟中毒的防治效果 ,从 1993～ 1999年对丰顺县的轻病区 (大寨村 )、中病区 (湖陂村 )和重病区 (安全村 )的饮用水氟情况和 8～ 12岁儿童氟斑牙率及尿氟、水氟进行了调查。结果显示 :安全村改水后饮水氟含量稳定在 1.0 m g/L 以下 ,8～ 12岁儿童氟斑牙检出率、中度以上氟斑牙检出率及氟斑牙指数呈逐年下降的趋势 ,尿氟含量也保持在正常范围之内。相反 ,改水后湖陂、大寨 2村的饮水氟很不稳定 ,而且经常超标 ,上述 4项指标下降趋势不显著 ,并且高于安全村。改水降氟后能否保证群众饮水氟稳定在 1.0 mg/L 以下 ,是预防饮水型地方性氟中毒的关键 In order to understand and summarize the effect of water diversion on endemic fluorosis in Guangdong Province, from 1993 to 1999, we analyzed the prevalence of endemic fluorosis in Fengshun County, ) Of fluoride in drinking water and children aged 8 to 12 dental fluorosis and urinary fluoride, fluoride were investigated. The results showed that the fluorine content of drinking water in safety village was stable below 1.0 mg / L, the detection rate of dental fluorosis, the detection rate of dental fluorosis and the dental fluorosis index in children aged 8 ~ 12 showed a declining trend year by year , Urinary fluoride content also remained within the normal range. On the contrary, after the water diversion, the drinking water quality in lakeshore and Dazhai 2 villages was very unstable and often exceeded the standard. The downward trend of the above four indicators was not significant and was higher than that of safety villages. Is it the key to prevent endemic fluorosis in drinking water if fluoride is stable below 1.0 mg / L?