Based on the outcrops, cores and well logs, strata in the Late Palaeozoic of Ih Ju Meng area in Ordos Basin are divided into zones by using sequence stratigraphy analysis of the Late Carboniferous and base level cycle analysis of the Permian. There are six types of sedimentary systems, including tidal flat, fan delta, shallow water delta developed during Taiyuan Age, alluvial fan developed during Permian, meandering river developed during Shanxi and late Shihezi Age, and braided river developed during early Shihezi Age. The main sandstone body for oil storage is constructed by distributary channel filling, subaqueous distributary channel filling of fan delta and shallow water delta, braided channel filling of alluvial fan, longitudinal bar of braided river, point bar, crevasse, and levee of meandering river. The authors also suggest that the lithofacies palaeogeography of the Late Palaeozoic of the study area, controlled by tectonicetting and the resultant slope, is dominated by fan delta and alluvial fans in the west, and by shallow water delta, meandering rivers, and braided rivers in the east