Abstract: The degradation of aldicarb and its metabolites in soil at different conditions were studied and discussed.Theresults showed that aldicarb degraded rapidly in various types of surface soil with corresponding T_0.5 at 3 to 8 days. TheT_0.5 of total residue including aldicarb sulfoxide and sulfone ranged from 30 to 65 days. The main factors effectingaldicarb degradation were temperature and the activity of soil micrcorganism. In deep soil which temperature and organicmatter content were lower,T_0.5 of aldicarb and total residues were observed to be 34 to l20 davs and 159 to 686 davs re-spectively.And aldicarb sulfoxide was much more difficult to be degraded into sulfone.