初步研究了大蒜、苦楝、苦参3种植物的提取物室内浸杀土蜗的效果，结果表明：浓度为8mg／L的大蒜提取液48h的杀螺率达到70％，苦楝提取液浓度为80mg／L时48h的杀螺率达90％，浓度为22．4mg／L的苦参提取液96h的杀螺率达90％；大蒜、苦楝、苦参提取液浸杀土蜗48h的LCso分别为4．96mg／L、37．46mg／L、45．60mg／L，其杀灭土蜗的效果为：大蒜〉苦楝〉苦参。“,”The killing effects on Galla were examined by using the extractant from Allium Sativum L. （AS）, Melia azedarach L. （MA） and Sophora flavescens Ait（SF）. The results showed that the mortality rate reached 70% when Galla exposed to the extractant from AS（8 mg/L） for 48 hours, the mortality rate reached 90% when Galla was treated by extractant from MA（80 mg/L） for 48 hours, and the mortality reached 90% when Galla was treated by extractant from SF（22.4 mg/L） for 96 hours. The LCs0 of the extractant from AS, MA, SF were 4.96 mg/L, 37.46 mg/L and 45.60 mg/L, respectively. In conclusion, the killing effects on Galla of the 3 plant species were ranked as AS〉MA〉SF.