Many pesticides are toxic and most of them are scattered into the land after being applied to the vegetable fields in various ways. Under environmental conditions, most of them can be gradually transformed or decomposed or even disappear due to volatilization, scattering, and the action of microorganisms. However, a small amount of pesticides remain in the vegetable body eventually, causing the residue. Ultimately, it affects the health of the human body. First, organochlorine pesticides: 666, DDT and other physicochemical traits stable, long residue, metabolites of long-term residual aftereffect is the main pesticide pollutants in the pesticide environment, vegetable residues can be transferred to the human body through the food chain Accumulated in fat (human body). 2. Organophosphorus pesticides: Dimethoate, trichlorfon, and dichlormone have relatively small residues, are easily hydrolyzed, and have a short residue period, but have different levels of residual problems. Dimethoate: ADI (per person intake limit) 0.05mg/Kg (body weight). Residues in leaf vegetables can reach 0.7ppm, exceeding the standard (1ppm) more than twice. Trichlorfon: The half-life of Chinese cabbage is 0.7-1 days, and the safe waiting period is 3-6 days, so it can be harvested 7 days after application. Third, urethane (Cryvinine): low toxicity to humans and animals ADI 0.1mg/Kg (body weight). Fourth, the United States and the United States and the United States and the United States: Fumei double, Fumei zinc teratogenic effects on animals. ADI 0.005 mg/Kg (body weight). Fifth, the type of Senson: Zeson and dexamethasone have teratogenic effects on animals, its degradation products ethylene urea also mutagenic effect. ADI 0.005 mg/Kg (body weight). 6, chlorothalonil: sensitization. ADI 0.03 mg/Kg (body weight).