Based on the strategic situation and function and the cultivated land detailed information in the west region in China,the degenerative reality of cultivated land and its developing tendency was analyzed,including soil erosion,desertification,salinization, nutrient loss and soil deterioration, pollution,especially the nonagricultural occupation and loss in cultivated land et al. Meanwhile the effect of degenerative land on sustainable development of economy and society in west region of China was discussed and the controlling countermeasures were proposed.