Abstract: The people's growing need for a better life has put higher demands on food output. The purpose of this paper is to scientific analyse the ideals of Eating-full and Eating-well, the theoretical analysis and GM model are used to predict the target of cultivated land protection, and to provide scientific reference for the strategic decision-making of cultivated land protection under the beautiful background of China in 2035. The results show that: (1) In the perfect ideal state of the theoretical hypothesis, the amount of cultivated land to meet the needs of Eating-full is 1.18×108 hm² , the amount of cultivated land needed to achieve Eating-well is 1.43×108 hm² respectively, which is difficult to meet the demand. Under the dual situation of Eating-full and Eating-well, the range of cultivated land is 1.25×108~1.38×108 hm² ; (2) In conclusion, as the core issue of food security in the context of China, “Eating-full and Eating-well” is the overall grasp of self-organization system of the national demand, social development and cultivated land resources in the process of spatiotemporal evolution; (3) There is a risk of insufficient demand for cultivated land in the population peak year of 2030 based on the perspective of quality of food demand. Implementing the strictest cultivated land protection system will still be the national policy that we must adhere to. Ensuring the "purity" of cultivated land quality will become an important direction for the transition of cultivated land protection.