From an ecological point of view, land degradation refers to the deterioration of plant growth conditions and the decline of land productivity. From the perspective of system theory, land degradation is the result of the combination of human and natural factors. In essence, the basic connotation and process of land degradation are reflected in soil degradation, including physical, chemical, and biological degradation. In recent years, “soil degradation” has been widely used to replace land degradation in the world. However, just because the land is a natural complex of rocks, landforms, climate, hydrology, and biology, its structure and function are far beyond the scope of soil, and it is not comprehensive to replace land degradation with soil degradation. In addition, land degradation is a very complex and comprehensive dynamic process, which contains a strong concept of time. The so-called degradation and non-degradation should be understood by comparing the quality and quantity of land in different periods, such as deserts, Gobi, snow, and some rocky desert areas. For a long period of time, it is the same in quality and quantity, so it cannot be incorporated into degraded land. Specifically, land degradation is a significant decline in land quality (quantity) during the comparison period.