Abstract: The organophosphorus pesticide residues of more than 20 kinds of leaf-vegetables, such as those in Cruciferae、Convolvulaceae、Umbelliferae、Composite、Amaranthaceae etc.were studied with FT-NIR for the first time.Methamidophos, the principal materials, and other three kinds of pesticide (representing high、middle、low poisonaccordingly) were investigated. The differences in the spectra of different vegetables were discussed. The organophosphoruscharacteristic radicals in the first overtone、difference technology、derivative pre-treatment etc. were used to decipher theprimary peak.To compare with GC-MS method, FT-NIR proved to be an easy、fast、reliable and practical method in thedeterment of organophosphorus pesticide residues.

Key words: FT-NIR, organophosphorus pesticide residues, leaf-vegetables, GC-MS