Abstract: A simple,cheap and accurate petroleum vapor concentration analysis method is established by exploring the conditions of GC analysis to monomer hydrocarbon and petroleum vapor,and some formulae are educed to appraise the relation between monomer hydrocarbon/petroleum vapor concentration and chromatogram peak area.In practical application,petroleum vapor concentration can be calibrated by standard spectrogram of general hydrocarbon or a certain monomer hydrocarbon.The method and test data obtained from test can provide base references to relative research organs and management departments.