Abstract: By using the sequence stratigraphic theory,the isochronal stratigraphic framework of coal measure strata was established for Yanan Formation in Binchang region,Ordos Basin.The depositional systems and sedimentary microfacies were divided,and the sedimentary evolution characteristics were summarized.The results show that Yanan Formation mainly contains three segments,and it can be subdivided into one three-order Sequence and three four-order Sequence.Sedimentary system in study area is meandering river,which consists of flood plain,swamp and interdistributary bay microfacies.In particular,swamp and plain are the favorable environments for forming thick and stable coal measures.