Atrazine and Acetochlor residues in corn field soil were determined by gas chromatography.Results showed that the fortified recoveries of Atrazine and Acetochlor were 85.9~87.6% and 87.4~89.4%.Coefficient of variation were 3.93~4.67% and 4.67~5.60%.Recoveries ratio were more than 80%,which meet with requirements of pesticide residue analysis.