Analysis of sulfur containing organophosphorus insecticides by gas chromatograph with a dual channel flame photometric detector (FPD-GLC) and data processings using a digital integrator were investigated.With P mode, the calibration curves of all insecticides employed showed the linear range from zero to hundreds or thousands nanograms. With S mode, also, similar results were obtained, however, these indicated the linearity with only log-log scale. Moreover, with the dual channel FPD-GLC attached with digital integrator, simultaneous identifications of the insecticides contained sulfur and phosphorus in the molecule could be done.The resolution of salithion, malathion, fenitrothion, ethion, methyl trithion, and EPN were obtained on Apolar 10C. Ronnel, fenitrothion, ethion, and EPN were separated on QF-1. From above results, Apolar 10C was useful for organophosphorus insecticides analysis.Many interfering peaks were shown at the shorter retention time on the gas chromatograms of vegetable extracts in the S mode. But, few interfering peaks were shown in the P mode.