根据地表沉积相特征及其对气候变化的反映，着重讨论了西藏雅鲁藏布江中游沙地形成时代、演化过程和气候变化。沙地早在中更新世中期的０．８ＭａＢ．Ｐ．就已出现，经历了强烈发展、缓慢发展或相对稳定和缩小与固定的多次迭覆更替，并呈不断扩大趋势。与此同时，气候也经历了冷干和暖湿的多次变化，并表现出不断向干冷化方向发展的趋势。 According to the characteristics of surface sedimentary facies and its reflection on climate change, the forming time, evolution process and climate change of sandy land in the middle reaches of Yarlung Zangbo River in Tibet are emphatically discussed. Sand in the mid-mid-Pleistocene 0.8MaB. P. Has emerged, experienced strong development, slow development or relatively stable and narrow and fixed multiple replacement replacement, and has been expanding. At the same time, the climate has undergone many changes in the dry-cold and warm-wet conditions, and shows a trend toward continuous cooling.