Abstract: Meticulous geochemical survey, which is seldom used in rolling exploration and development in China, tests the contents of acidolyzed hydrocarbon,pyrolyzed hydrocarbon fluorescence spectrum and altered carbonate in soil samples collected at a certain depth in target areas and treated with a series of special methods, and determines the favorable area for exploring oil and gas through comprehensive analysis of the abnormities of these indexes.Application in the faulted zone in the south of the Nanyang Sag shows that it is a useful supplimentary method for rolling exploration and development.