Provided is a diphenylpyrazole-based compound of following formula (I), or its pesticidally acceptable salts, which is a novel inhibitor targeting pest GSTs, has broad inhibitory activities against GSTs in various pests, and can effectively delay the metabolism of insecticides by GSTs in pests, thereby reducing the metabolic resistance of pests to insecticides, and is suitable for use as a synergist for insecticides. ##STR00001##

Provided is a diphenylpyrazole-based compound of following formula (I), or its pesticidally acceptable salts, which is a novel inhibitor targeting pest GSTs, has broad inhibitory activities against GSTs in various pests, and can effectively delay the metabolism of insecticides by GSTs in pests, thereby reducing the metabolic resistance of pests to insecticides, and is suitable for use as a synergist for insecticides. ##STR00001##