3- bromo-1 -(3-chloro-2-pyridyl) -1H-pyrazole-5-carboxylic acid can be used as the intermediate of chlorantranzoamide, which is a new class of high efficiency and low toxicity o-formylaminobenzamide insecticide Chemicalbook, developed by DuPont Company in the United States. It also has good insecticidal activity at very low concentration. For lepidoptera insects have special effects, chemical name is 3 - bromine - N - {chlorine - 2 - methyl - 4-6 - [(methyl amino) carbonyl] phenyl} - 1 - (3 - chloro - 2 - pyridyl) 1 h - pyridine - 5 - amide.