Abstract: The Tertiary strata in the Ningming,Haiyuan and Shangsi Basins,Guangxi can be grouped,from base upwards,into the following four formations;Lower Dazha,Upper Dazha,Ningming and Nonghui Formations on the basis of Hthologic,palaeontological and seismic data coupled with the previous data,and further be assigned to the pluvial fan fa-cies,fluvial facies,lakeshore facies,lacustrine and swamp facies in terms of lithological, sedimentological,grain size and seismic data.The present paper has also described the dis-tribution and controls of individual sedimentary microfacies on the reservoir quality during the different stages of Tertiary time.