A method based on QuEChERS pretreatment technique and ultra high performance liquid chromatography-tandem mass spectrometry（UHPLC-MS/MS） was developed for the simultaneous determination of 31 sulfonylurea herbicide residues in soil.After optimizing the pretreatment and chromatographic conditions

methanol and 0.1% formic acid +5 mmol/L ammonium acetate

1% acetic acid-acetonitrile and 25.00 mg/mL C18 were used as the mobile phases

extraction solvents and purification agents

respectively.There were good linear relations for 31 sulfonylurea herbicides with their correlation coefficients（r2） no less than 0.998 0.The limits of quantitations（S/N=10） were in the range of 0.012-2.321 μg/kg.Average recoveries for the analytes at three spiked levels of 10

100 and 400 μg/kg ranged from 71.8% to 119% with their relative standard deviations（RSD） of 0.62%-13%.Except for nicosulfuron

trifloxysulfuron sodium

rimsulfuron

flazasulfuron and halosulfuron methyl

other compounds showed weak matrix effects.With easy operation

good sensitivity and accuracy

this method is suitable for the simultaneous detection of 31 sulfonylurea herbicide residues in soil.