A method for extracting,clearing off and determining residues of cypermethrin,fenvalerate and deltamethrin in soil has been developed.The method uses pertole mether-acecton (V/V,2:1) mixture to extract residues of the pesticides in soil samples,a column (20 cm×1.5 cm) packed with 3g Florisil to clear the mixture of the residues,and pertolem ether-ethyl acetate (V/V,9:1) to elute the residues from the column.Then the eluent is determined by gas chromatography (ECD-GC) with a HP-5 (30 m×0.32 mm×0.25 μ m) capillary column and quantified by the single pointexternal standard method.In an experiment of using this method,the recovery rates of cypermethrin,fenvalerate and deltamethrin were found to be 90.10%～93.02%,90.62%～91.07% and 89.67%～91.53% respectively with RSD being 2.02%～2.49%,2.51%～3.70% and 3.08%～3.42%,respectively in the operation.And the minimum detectable quantity was 1.00 pg.The relative standard deviations (n=5) of the equipment ranges from 1.37% to 2.88%.This method is proved to be easy in operation,and high in sensitivity,reproductivity and selectivity.