Abstract: 14 indexes about quantity security, quality security and ecological security were selected to evaluate the cultivated land resources security (CLRS) of China in 2007. The data were derived from the land use survey and the reports of agricultural land classification from the Ministry of Land and Resources of China, the Second National Soil Survey (1978) and National Bureau of Statistics of China. The results can be concluded as follows. (1) the CLRS of China is not high in 2007 with a score of only 0.517. Among the four regions, the evaluation value of CLRS is higher in eastern China but lower in western China. At provincial level, the scores of CLRS of Xinjiang and Tibet in Western China and 10 provinces of eastern China, such as Shandong, Fujian, Zhejiang, is higher than those of the others. Provinces with lower scores of CLRS are mostly distributed in Western China, including Shaanxi, Inner Mongolia, Gansu, Qinghai, and Ningxia. (2) The quantity security score of CLRS in China is 0.195, higher in Northeast China but lower in regions of Loess Plateau, North China Plain and Sichuan Basin. The quick loss of cultivated land caused by construction occupation and the policy for grainto- green and the high inventory of cultivated land in 2020 under the consideration of regional tasks for grain production are the main reasons resulting in the low quantity security score of CLRS in the three regions. (3) The quality security score of CLRS in China is 0.171, higher in Northeast China but lower in eastern China. Natural land quality is the key factor affecting regional quality security. (4) The ecological security score of CLRS in China is 0.171, higher in Northeast China but lower in eastern China. Eco-environmental problems caused by excessive use of chemical fertilizer, agricultural pesticide and agricultural film are the main reasons leading to lower ecological security in eastern China, but soil and water erosion is the key reason for western China.

Key words: China, cultivated land resources security, ecological environment, quality, quantity