Abstract: n order to study and establish the national standard method of 4 kinds of pyrethroid pesticide residues in greasy wool by a gas chromatography - ECD method, the greasy wool?were added 4 levels mixed?standard reagent (0.06?μg/g,?0.30?μg/g,?2.00?μg/g,?5.00?μg/g),?which contains?4 kinds of pyrethroids, then the sample was extracted by n-hexane and aether（Volume ratio2:1）, and then purified by a neutral alumina column and an florisil column and eluted by 4ml of n-hexane and ethyl acetate（Volume ratio95:5）, finally detected by gas chromatography -ECD, the quantitative results were obtained based on external standard method. The result shows that the limits of detection of 4 kinds of pesticides were 0.020 μg/g, 0.060 μg/g, 0.024 μg/g and 0.030 μg/g respectively, the recoveries range were from 79.4% to 101.2%, the relative standard deviations were between 1.20% and 3.08%.So the method is an favorable separation effect, less disturbance, accurate, easy, quick, less use of solvent and environmental friendly.

Key words: gas chromatography, greasy wool, pyrethroid pesticide, residue