目的　调查移民建镇地区血吸虫病流行因素 ,为制订该类地区血吸虫病控制对策提供依据。　方法　选择退人不退耕的单退点和退人又退耕的双退点各 2个 ,采用常规方法调查各试点钉螺分布、人畜感染以及滩地野粪污染情况。　结果　移民建镇试区钉螺分布广 ,单退点感染螺密度较双退点高 ,两个单退点钉螺感染率分别为 0 .69%、1.88% ,两个双退点钉螺感染率分别为 0 .3 9%、0 .2 9% ;滩地野粪污染仍较严重 ,尤其以单退点为甚 ;人、畜血吸虫感染在单退点相当严重 ,居民血吸虫抗体阳性率 (IHA)高达 2 0 %以上 ,耕牛粪检阳性率最高达 3 4.48%。　结论　移民建镇地区依然存在血吸虫病流行因素 ,单退点血吸虫病流行更为严重 Objective To investigate the epidemic factors of schistosomiasis in immigrant towns and settle towns and provide basis for the development of schistosomiasis control measures in this area. Methods Two single back-off points for returning to farmland without returning farmland and two back-off points for returning farmland and returning farmland were selected, and the snail distribution, human and livestock infections and the contamination of beach and wild manure were investigated by routine methods. Results There was a wide distribution of Oncomelania snails in the trial area of ​​immigrated towns and villages. The density of snails infected with single retreat point was higher than that of double-retreat point. The infection rates of two single retreat points were 0.69% and 1.88%, respectively. 0.93% and 0.29% respectively. The stool pollution in the beach was still serious, especially in single retreat point. The infection rate of schistosomiasis in humans and animals was quite serious in single retreat point, and the positive rate of IHA was as high as 2 0% or more, cow dung seized positive rate up to 3 4.48%. Conclusion There are still epidemic factors of schistosomiasis in the areas where immigrants build towns, and the epidemic of schistosomiasis is more serious