The regularity of the vertical migration of hydrocarbons and some characteristics of the dis-tribution of subsurface oil and gas in this area have been revealed through three-dimensional full-range scanning fluorescence spectrum analysis of the samples of rock cores from different depthsin well PCI and the samples of surface soil near well PCI．The three—dimensional full—range scan—ning fluorescent spectroscopy is one of the most effective methods for the study of the change ofthe composition of aromatics．