本文讨论了青藏高原东北部一个大型断陷盆地晚新生代期间地貌发育与环境演化问题,中新世至中更新世为盆地沉陷阶段,其中晚第三纪为青海东部内陆古湖的一部分,第四纪早期黄河发育,形成河湖交替环境,中更新世之后为盆地上升阶段,促使水系演化并形成最多达13级的黄河阶地与龙羊峡谷,气候从温暖湿润向干燥寒冷发展,特别自晚更新世晚期以来,在数次干寒环境下形成多种冰缘形态和风沙堆积,并促使湖泊退缩和咸化。 This paper discusses the geomorphologic development and environmental evolution during the Late Cenozoic in a large rift basin in northeastern Qinghai-Tibet Plateau. The Miocene-Middle Pleistocene basin was a basin subsidence stage, in which the late Tertiary was part of an inland ancient lake in eastern Qinghai. In the early Quaternary, the Yellow River developed and formed an alternating environment of rivers and lakes. After the mid-Pleistocene, it was the basin rising stage, which led to the evolution of the water system and the formation of the Yellow River terrace and Longyang Canyon up to 13 levels. The climate developed from warm and humid to dry and cold, Since the late Pleistocene, a variety of ice edge morphologies and aeolian deposits have been formed in several dry and cold environments, and the lakes have retreated and become salty.