The cause of the formation of the scoured pits and the runoff of the root rocks are studied through the experiment of the scoured pits which are along the river section from xiyaozipai in qingtong city to xiabaqing in taole town 本文通过对青铜峡市细腰子拜和陶乐县下八顷河段冲刷坑的试验研究,对冲刷坑的形成及根石走失成因进行了分析研究。