Abstract: A gas chromatographic method without derivatization was established for the residue analysis of 19 organonitrogen and organophosphorus pesticides in cereals, fruit and vegetable. The samples were blended or shaken with acetone-water for extraction. The extracts were partitioned with diehlormethane. The organic phases were cleaned by coagulation. The residues were determined by gas chromatography rquipped with NPD and a 1m long and 0.2 cm id glass column packed with 5% OV-17on chrom Q (80 - 100mcsh). All of the 19 organonitrogcn and organophosphorus pesticides were separated under constant temperature. The experiment showed that the method described above was applicable to the multircsiduc analysis of 19 pesticides in cereals, fruit and vegetable. The variant cocflicicnt for relative retention times was 0-1.19% and that of peak height reproducible was 1.30-7.9% The method has satisfactory recoveries (85.16-103.3%) and good variant coefficient (0.60-8.43%). The minimum tectability was 0.58 × 10^-11 - 6.10 ×10¹⁰ g , and minimum detectability concentration was 0.0004 -0.0610ppm.