The results surveying non-visible faults at east and west sides of Qinwangchuan basin and the comparison of terraces of rivers in the region indicate that the basin was formed in Neogene and became a close fault basin in late period of mid-Pleistocene by the compression and thrust of faults at east and west boundaries of the basin.The Jinqianghe river and Heimajuanhe river flow ed across the Qinwang chuan basin to the Yellow river along the ancient river course of two sides of the basin from late period of mid-Pleistocene to early period of late Pleistocene and a thick layer of alluvial and diluvial sand-g ravel was formed in the basin.The basin became an arid one from late period of late Pleistocene to early period of Holocene by continuous rising of Pingcheng basin and change of the river bed.