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山丘型血吸虫病流行区因地制宜进行沟渠硬化、沼泽地改塘等小环境改造措施后，钉螺面积减少了６６．１６％，活螺密度、活螺框出现率分别下降了７６．５４％和７６．１３％，阳性螺密度下降了１００％；居民血吸虫病患病率略有下降，１４岁以下人群感染率为０，无急性感染发生。而实施药物灭螺的对照组９年来钉螺面积仅下降了２７．６２％，活螺密度及活螺框出现率分别上升了２６．３５％和１５１．０１％，是小环境改造点的９．８４倍和１１．１３倍，同时居民血吸虫病患病率较１９８７年上升了３７．４４％，１４岁以下人群感染率为１．２１％，并有零星急性感染病例发生。小环境改造一次性投资费用高于药物灭螺，但与农田水利相结合的小环境改造措施能够产生一定的间接经济效益，因此远期效果仍将优于药物灭螺。
Hill-shaped schistosomiasis endemic area ditches hardened according to local conditions, swamp ponds and other small environmental transformation measures, the area of snails reduced by 66.16%, live lobe density, living screw box incidence decreased by 76.54% and 76 .13%, the positive thread density decreased by 100%; the prevalence of schistosomiasis a slight decline in the population under the age of 14 infection rate of 0, no acute infection. However, the snail area in the 9-year-old control group decreased by only 27.62%, and the live snail density and the occurrence rate of live snails increased by 26.35% and 151.01%, respectively. 84 times and 11.13 times respectively. At the same time, the prevalence of schistosomiasis in residents increased by 37.44% compared with that in 1987, and the infection rate was 1.21% in people under 14 years of age with sporadic acute infection. The cost of a one-time investment in small-scale environmental improvement is higher than that of drug snails. However, the small-scale environmental improvement measures combined with farmland water conservancy can produce some indirect economic benefits, so the long-term effect will still be superior to that of drug snails.