Trichlorfon is a kind of organophosphorus pesticide phosphate ester. The hydroxyl group in phosphoric acid molecule is replaced by organic group to form phosphorus carbon bond compound, and phosphoric acid is esterified to be phosphate ester. 0.01 mg / (kg. D) per day, which makes organophosphorus pesticides easy to decompose and lose toxicity under alkaline conditions, and is relatively stable in acidic and neutral solutions. However, the toxicity of dichlorvos, a product decomposed by trichlorfon under alkaline conditions, increases by 10 times. Its toxicity is mainly acute poisoning, and chronic poisoning is less.