Abstract: Rural land transfer is the only way leading to the optimized allocation of agricultural resources, the improved efficiency of agricultural labor production, and the accelerated agricultural modernization. However, “de-graining” trend, occurred during rural land transfer, has a negative impact on national grain security. By analyzing the evolution of rural land transfer policy, its basic situation and the causes of “de-graining”, this paper found that “de-graining” influences grain yield, the quality of cultivated land, and farmers’ enthusiasm for growing grains. Therefore, to avoid de-graining and ensure national grain security, this paper provides the following suggestions: to give large grain producers and grain processors the priority to take more arable land, to establish guiding standard for land transfer fees, to avoid government enforcement during land transfer, to strengthen the supervision of agricultural land usage, and to increase subsidy for those grain producers with low returns.