Xizang plateau has been lifted since the end of the Tertiary period—the current height of the surface of the plateau ranges from 4500 to 5000 meters—and it is continuously lifting. Due to the arid and cold climate, the processes of chemical weathering and soil formation are weak. The soils of the region are light in texture; their clay minerals are mainly hydromica and chlorite. The synthesis of biomass and the decomposition of organic materials are very slow, and fulvic acid is generally predominant in the humus of soil. Because of the lift of the land surface, the soils originally formed in a low altitude were lifted to a high altitude. Therefore, some micromorphological and mineralogical features of paleosol, including ferric oxide impregnation matrix, fragments of ferruginated mineral grains, and illuviation argillans, gibbsites, and kaolinites, which are inconformable to the current soil formation process, are usually found in the soil profiles.