Based on comprehensive application of core, logging, seismic and grain size analysis data, this paper has clarified the sedimentary microfacies of sandstone of Fuyu oil-bearing layer in Gaotaizi area, Songliao Basin. Distributary channel inter distributary bay deposit, crevasse channel are developed in The strata of Fuyu oil-bearing Layer. The detailed research of different sand beds’ of Sedimentary microfacies on Fuyu reservoir provide important geologic evidence in the finding of the remaiping oil.