Numerous studies show that although gypsum and other salt deposits indicating xerothermal climates once occurred over a wide area of the eastern margin of the Qinghai-Tibetan Plateau within the arid zone prior to the establishment of the model East Asian monsoon systems. The results of research in this paper may provide not only new sedimentological data for the approaches to the evolution of the Cenozoic arid zones in China and global climatic changes but also significant atmospheric circulation evidence for the uplift of the Qinghai-Tibetan Plateau and the origin of the east Asian monsoons.