Abstract: A field experiment was conducted to reveal residual degradation dynamics and the final residues of imidacloprid in peanut and soil, the residues of imidacloprid in peanut and soil were determined by Waters2695 liquid chromatograph. The degradation dynamic test results showed that the residues in the peanut plant were undetected and the half-life was not calculated; The half-live of imidacloprid in soil was 4.7~9.5 d, and more than 74.7% degradation after application for 21 d. The final residue tests showed that 10% imidacloprid CS for control of peanut grub, the highest dosage of 260 g a.i./100 kg seed （preparation 2 600 g/100 kg seed） in peanut seed before sowing.

Key words: imidacloprid, peanut, soil, residue, safety assessment