Abstract：The study of sediment source is significant in understanding and identifying favorable sedimentary facies belts and distribution of reservoir sands in the study area as well as in prospecting for favorable oil and gas reservoirs. The study area of this paper, Baiju depression, is at a low level of exploration. Research results concerning the sediment source of the 1st Member of Taizhou Formation are very insufficient. Based on an integrated study of dip logging data, heavy mineral data and core data, the authors probed into the orientation of the sediment source in this area. It is concluded that the sediment source of Yangxin secondary depression was derived from the Jianhu uplift in the northwest during the deposition of the 1st Member of Taizhou Formation.