Abstract: The Lianhua sandstones 5、6 in areas 2、3 of Gaosheng oilfield in the western Liaohe depression were discussed in this paper. On the basis of study of cores, various geneticcriteria and the quantitative logging information, using method of sedimentary microfaciesfor reservoir development, a braided channel model of gravity flows in deep lacustrine environment was built and the spatial distribution and evolution of the sand-conglomeratebodies were clarified. It was pointed out that reservoir properties were controlled by sedimentaty factes. In addition, the relationship among the formation of the sand-conglomerate bodies of the braided gravity flow channel in the deep water, fault structures, palaeoclimate and palaeotopography was disscussed.