Abstract: The aims were to seek for the method of reduce pesticide residues of vegetables in greenhouse, and promote the healthy development of vegetable industry. Chlorothalonil, fenvalerate and dimethoate was selected as the test material. The degradation characteristics of pesticide residues were studied. The results showed that in the first day, fenvalerate, dimethoate, chlorothalonil residues in lettuce were higher than that of tomato respectively 42.9%, 44.9%, 57.8%. In seventh day, tomato and lettuce pesticide residues were 154-285μg/kg, 258-528μg/kg. The first day, dimethoate, chlorothalonil, fenvalerate residues in celery of greenhouse was higher than that of field respectively 2.9%, 7.1%, 6%. During 5-20 days, the pesticide degradation rate of field was also higher than that in greenhouse. The initial concentration related with edible part surface area ratio of vegetable. Pesticide degradation rate of greenhouse vegetables was obviously slower than the field vegetables. Subsidence phenomenon of pesticides was an important factor in the impact of pesticide residues.