Abstract: Based on field geological mapping,route survey and sampling in the Zoigê Basin,northeastern margin of the Qinghai-Tibet plateau,and in the light of the view point of stratigraphic multiple classification,the paper discussed lithostratigraphic features of the Late Neogene(mainly,the Pleistocene and Holocene)in the basin.The geological records and lithofacies of 8 typical sections(including outcrops and drilling wells)were described,and combined with the dating results of 14C,TL,OSL and ESR methods and paleontologic data,the Upper Neogene strata were classified and correlated.The fluvial deposits,occurred in the river valleys of the Yellow,Baihe and Heihe Rivers,had varied features in different stages and reflected some variety of the basin developing,which should be controlled by the neotectonic background.There were four drift beds of mountain glacier in western part of the basin,and named the 4366 Highland moraine(middle Middle Pleistocene),the Gongbalake moraine(late Middle Pleistocene),the Zha’erji moraine(early Late Pleistocene)and the Anna’er moraine(late Late Pleistocene),respectively.The glacial deposits could be found in northeastern and southeastern parts of the basin.In addition,there developed some Late Neogene eolian deposits in the basin.The chronostratigraphy,paleobiostratigraphy and climite-stratigraphy of the Late Neogene deposits in the basin will be further explored in another paper.