The Huimin depression is one of the Cenozoic fault basins around the Bohai Bay. Palaeogene strata are well developed in the western part. Deltas are the important depositional system favourable for petroleum accumulation, and the sand bodies are the major oil -gas potential reservoirs. In the Shahejie-3 Member (the No. 3 Member of the Shahejie Formation) there are developed complete megacyclic depositional successions of deep-lake (shale, clay) facies-prodelta subfacies (shale-clay stone or turbidity fans) -delta front and plain subfa-cies (sandstones). This paper presents the studies of the sedimentary facies, delta systems and their related sandstones, and reveals the depositional history of delta systems in the Palaeogene Shahejie-3 Member in the Huimin depression.