Abstract: By means of ICP—MS,thirty seven sandstone samples of Xiaoheba Formation have been tested,and their rare earth elements and volume of relative associated trace elements have been analyzed.It indicates that total rare earth elements are higher.LREE/HREE and L_aN/Yb_N show that differentiations between LREE and HREE are obvious;LREE is abundant,while HREE is defective.LREE is obviously rightward heeling,while HREE is even,and Eu is obviously negative anomaly,while Ce is normal.According to characteristics of Ce_anom,seawater was in an anoxic environment,while it was an oxidizing environment near the Qianzhong uplift.The geochemical characteristics of rare earth elements indicate that the provenance came from active uplifted continental margin.Research results of predecessors suggested that the provenance came from the west wing of Xuefengshan uplift in a line of Guzhang,Zhijiang,Yuanling,Huaihua area,also involved basic rocks,ultrabasic rocks,basic—intermediate effusive rocks of Neoproterozoic Banxi Group.Banxi Group also appear in Changde,Taoyuan,Anhua area.