In this paper, we adopt gas chromatography/mass spectrometry (GC/MS) to analyze respectively the smokes of 90# gasoline, 0#diesel, lacquer thinner and alkyd diluent generated from their combustions on the carpet. In our experiments, we take the smoke produced from combustion of pure carpet as a blank to eliminate the interference components generated by the carpet combustion. Then we compare the total ion chromatograms of these four flammable liquids to find out the similarities and differences of components existing in their combustion smoke, which can determine characteristic components existing in the their combustion smoke.