本文对灭多威在土壤中的降解规律进行了研究。结果表明，灭多威在土壤中的降解符合动力学一级反应，按推荐量施药，灭多威在土壤中降解较迅速，降解半衰期为５．０４天，施药后第１５天，灭多成在土壤中的降解率为９７．７％，施药量与残留量呈正相关，相关系数为０．９９９８。提示：按推荐量施药，灭多成对土壤污染较轻。 In this paper, the degradation of methomyl in soil was studied. The results showed that the degradation of methomyl in soil was in accordance with the kinetic first order reaction and the pesticide was applied in the recommended amount. Methomyl was degraded rapidly in soil with a half-life of 5.04 days. On the 15th day after application, The degradation rate of soil into more than 97.7%, the application rate and the residual amount was positively correlated, the correlation coefficient of 0.9998. Tip: The recommended amount of pesticides, eliminate more pairs of soil pollution lighter.