Abstract: The components in the fluid catalytically cracked (FCC)gasoline were detected by capillary column gas chromatography-mass spectrometry(GC/MS). Under the fixed conditions , the FCC gasoline was pretreated with concentrated sulfuric acid and potassium permanganate solutions. GC/MS was performed to qualitative analysis of hydrocarbons and oxygenic components in FCC gasoline. Many techniques such as chemicel reaction, gas chromatography (GC) retention time, standard substance addition and reference method were used to identify the structures of the components obtained by GC/MS. The hydrocarbon groups were obtained by adding a hydrocarbon with the same type. The oxygenic compound correction factors via hydrocarbons in gasoline were determined. The contents of staturated hydrocarbon, olefin hydrocarbon, alkene, aromatic hydrocarbon (SOA) and benzene, toluene, ethylbenzene, xylene(BTEX) and oxygenic compounds were measured by correcting area normalization method. The relative standard deviation is less than 3. 3%.