Abstract: The effects of silica gel, adsorption column, fluorescent indicator, oxygenated blending components, sample depentaning and other factors on the determination results of saturates, olefins, and aromatics in gasoline were studied. The main influence factors on the result of gasoline component and the method accuracy were found, and the precision and the practicability of the method are improved. It was verified that the pore volume of silica gel and the sample depentaning process are main influence factors. The result of saturates depresses,and the olefins in gasoline increases with enlargement of pore volume of silica gel. If C₂～C₅ content in gasoline is high, depentaning process should be done according to SH/T 0062.