An ultra performance liquid chromatography-tandem mass spectrometric（UPLC-MS/MS) method was developed for the determination of carbofuran and aldicarb,as well as their metabolites carbofuran 3-hydroxy,aldicarb sulfone and aldicarb sulfoxide in cucumber,tomato and cowpea.The samples were extracted with acetonitrile and QuEChERS salt packets containing 0.5 g sodium sesquihydrate,1 g sodium citrate,1 g NaCl and 4 g MgSO4,and purified by pass through solid phase extraction using an Oasis PRiME HLB column,then analyzed by UPLC-MS/MS.The matrix effects were observed in the analysis of the analytes in sample.The quantitations were performed by the external standard method with matrix matched calibration standards.There were linear relationships for carbofuran,carbofuran 3 hydroxy,aldicarb,aldicarb sulfone and aldicarb sulfoxide in the range of 0.001-0.5 mg/L with their correlation coefficients（r) larger than 0.996 0.Recoveries for cucumber,tomato and cowpea at spiked levels of 0.02-0.2 mg/kg ranged from 80.4% to 110%,with relative standard deviations（RSDs) of 1.1%-4.8%.The limits of detection（LOD,S/N=3) for carbofuran,carbofuran 3-hydroxy,aldicarb,aldicarb sulfone and aldicarb sulfoxide were 0.07,0.3,1.0,4.0 and 13 μg/kg,respectively,and the limits of quantitation（LOQ,S/N=10) were 0.2,1.0,2.0,13 and 42 μg/kg,respectively