Abstract: The He 8 member(the eighth member of Shihezi Formation)in southern Sulige is important reservoir of Sulige Oilfiled,Ordos Basin. In order to make clear the lithofacies characteristics and sedimentary models of the target strata in the study area,there is an important guiding effect for the oil and gas exploration. The typical lithofacies of Shihezi Formation was divided into eight types through core observation of 22 wells,and the lithofacies assemblies were divided into four types. According to the shape characteristics and contact types of logging curves of 167 wells,the logging curves were divided into four types. Combined with lithofacies and logging curves,the sedimentary microfacies were divided into eight types. The distribution of the lithofacies assemblages and sedimentary model were summarized. The assembly A developed in braided delta plain in the north,the assembly B developed in the transition area between the braided delta plain and braided delta front in the north,the assembly C developed in channel of braided delta front in the south,and the assembly D developed in deep lake of braided delta front in the southwest.