Bsaed on underground md turface geochemical data and characteristics of regionalgeochemical field. the present paper has made oil-prospect evaluation of Lower YangtzeRegion. It is considered that the Upper Paleosoic Permian-Triassic System is the main targetbed for elploration and that. regionally. Taixing-Chaohu-Wangjiang area on the eastern side of the Tancheng-Lujiang fault should be selected as the main promising area for breakthrough in elploration. According to high content, complete components and sharp contrast ofhydrocarbon gases, geochemical achievements gained in thisarea can serve as reliable evidencefor evaluation of favorable areas of oil-gas accumulation.