灭螺是控制和阻断血吸虫病传播途径、防止血吸虫感染的最有效措施之一。灭螺的方法主要有环改灭螺、生物灭螺、物理灭螺和药物灭螺。环改灭螺效果巩固，适用于控制污染，但有螺环境复杂，投资费用大，普遍采用十分困难。生物灭螺至今未能选出一种能在实际中应用的方法。物理灭? Snail control is one of the most effective measures to control and block the transmission of schistosomiasis and prevent schistosomiasis infection. The main method of snail ring ring snail elimination, biological snail, physical snail and drug snail. The effect of circular reform is effective in controlling pollution, but there is a complicated environment with large investment cost and it is very difficult to adopt it universally. Biological snail so far failed to choose a method that can be applied in practice. Physical out?