The HPLC method for determination of imidaclothiz residue in cabbage and soil was developed, and its degradation and final residue were studied. The mean accuracies of the analytical method were 92.0-93.0% in soil and 88-93% in cabbage. The precision in cabbage ranged from 2.2% to 5.6%, and in soil from 2.0% to 5.0%. The minimum detectable amount of imidacothiz was 1 x 10(-10)g. The minimum detectable concentration was 0.0075 mg kg(-1) in cabbage and 0.003 mg kg(-1) in soil. The results showed that imidaclothiz degradation in soil and cabbage coincided with C = 0.0427e(-0.0923t), C = 0.739e(-0.279t). The half-lives were about 3.1 days in soil and 2.2 days in cabbage.