| A novel method of dispersive liquid-liquid microextraction（DLLME） and gas chromatography with flame photo detection（FPD） was developed for the determination of 23 organophosphorous pesticide residues（OPPs），including sulfotep,phorate,diazinon,disulfoton,chlropyrifos methyl,methyl parathion,runnel,fenitrothion,malathion,chlorpyrifos,fenthion,parathion,bromophos,pirimiphos ethyl,isofenphos methyl,phenthoate,methidathion,profenofos,ethion,triazophos,trithion,pyridaphethione and phosmet in water sample.The influence of extraction parameters including the types and volumes of extraction solvent and disperser solvent as well as extraction time were investigated. Under the optimum conditions,the calibration curves for 23 OPPs were linear in the range of 0.04-4.0 μg /L with correlation coefficients not less than 0.998. The limits of detection ranged from 0.002 μg/L to 0.016 μg/L. The recoveries of 23 OPPs at two spiked concentration levels of 0.08 μg/L and 2.0 μg/L were in the range of 75%-109% with relative standard deviations（RSDs） of 1.5%-13.3%.The DLLME technique showed the advantages of simplicity,rapidness,good recovery and high enrichment factor. |