通过对兰州市秦王川盆地东西二侧隐伏断裂的探测及区域河流阶地的对比 ,研究了该盆地的形成和演化特征 .结果表明 ,秦王川盆地形成于第三纪 .在中更新世晚期由于受东西二侧边界断裂挤压逆冲活动的影响而成为一个封闭式的断陷盆地 .中更新世晚期—晚更新世早期金强河及黑马圈河沿盆地二侧古河道穿过秦王川盆地 ,注入黄河 ,从而使盆地内堆积了较厚的冲洪积砂砾石层 .晚更新世晚期—全新世早期由于坪城盆地的持续抬升 ,河流改道 ,使秦王川盆地成为一个干旱盆地 Based on the exploration of hidden faults on both east and west sides of the Qinwangchuan Basin in Lanzhou City and the comparison of regional river terraces, the formation and evolution characteristics of the basin have been studied.The results show that the Qinwangchuan Basin was formed in the Tertiary, and in the late Middle Pleistocene, East-west boundary crustal extrusion and thrusting activities and became a closed faulted basin.In the late Middle Pleistocene-Late Pleistocene, the ancient rivers on both sides of the Jinqianghe and Hemaomao riverside basins flowed through the Qinwangchuan Basin, The Yellow River, so that thicker alluvial-gravel sand and gravel layers were accumulated in the basin.In the late Late Pleistocene-Early Holocene, the Qinwangchuan Basin became a arid basin due to continuous uplift of Pingcheng Basin and diversion of rivers