According to the data from the field investigations with soil physical and chemical analysis,micro-morphological and electron-microscopical identification in the laboratory,the influence of plateau uplift on soil-forming environment in Qinghai-Xizang region is discussed on the view point of soil genesis.It shows that since Pliocene,the most noticeaLle changes of soil-forming environment in this area were the raising of the altitude of land surface,the increasing of the complexity of geomorphology,the reconstruction of atmospheric circulation by which specific climatic characteristics of plateau were formed,the gradual decreasing of the forest coverage replaced by the vegetation of alpine meadow,alpine steppe and alpine desert,and the soil-forming weathered crusts with diversity and complexity.Under these conditions,a particular soil region was formed on the plateau.