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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％及７６．１３％，阳性螺密度下降了１００％；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％、１５１．０１％，是小环境改造点的９．８４倍及１１．１３倍。不同环改方法控制螺情的近期及远期效果不一致，以沼泽地改塘效果最稳定，其次为沟底及两侧石砌并用水泥磨面的方法。
In the endemic area of hill-type schistosomiasis, the area of snail snail decreased by 66.16% due to the ditches hardening due to local conditions and the small-scale environmental improvement measures such as swamp pond alteration. The live snail density and the occurrence ratio of live screw snails decreased by 76.54% and 76% respectively .13%, the positive density of spiraea decreased by 100%; while in the control group, the snail area decreased by only 27.62% in 9 years; the live spirometry density and the occurrence rate of live screw increased by 26.35%, 151 .01%, 9.84 times and 11.13 times that of the small environment reform. The effects of different methods of environmental improvement on the control of snails are inconsistent in the near future and long-term effects, and the results are as follows: the effect of changing swamps to swamps is the most stable, followed by the method of using cement grinding noodles and stonework on both sides.