Abstract: It is very important for confirmation of the sedimentary source direction of Yanchang Formation to research the sedimentary facies of Yanchang Formation and direct the energy sources exploration. In order to confirm the sedimentary source direction of Yanchang Formation in Yichuan area of Ordos Basin,according as abundant analysis and test data,using characteristic of the sandstone lithology,the features of light and heavy mineral group,paleocurrent direction,and rare earth element distributing pattern,analyzed the sedimentary source of Yanchang Formation in Yichuan area.The study results show that the sedimentary source of Yanchang Formation in Yichuan area comes from north-east and south,the sedimentary source from north-east is the main,and that from south affect little.The mother rock derived form Archaean and Early Proterozoic metamorphic rock from the north-east part of Ordos Basin.