Abstract: The food security situation of China is“grain supply is basically self-sufficient，while soybean supply depends on imports”. But the position of soybean in China’s food security will be constantly increasing，as the improvement of residents’health and nutrition situation requires the variety of diet and nutrition levels to improve continuously. In this context，major grain producing provinces in China with relevant natural and social conditions will probably adjust their grain cultivation structure in the future.Based on the improved computable general equilibrium model and from the perspective of rigid constraints of water and soil resources，a policy simulation is done to probe into the problems of coordinating security and high-quality development among Heilongjiang，Jilin，and Liaoning provinces. The discoveries are as follows：when targeting the weak links of national food security，and taking measures only by adjusting the planting structure，if Heilongjiang Province reduces its rice and corn planting areas and expands its soybean planting area，its impact on social economy is limited，with the energy output falling slightly and the water consumption of the whole society decreasing；if Jilin Province reduces its corn planting area and expands the soybean and rice planting areas，its social economy will be improved，with the energy output increasing and an overall water consumption mounting as well；and if Liaoning Province reduces its corn planting area and expands its soybean planting area，its social economy，water consumption，and energy output show a downward tendency. Thus，the following policy suggestions are put forward：when food security is guaranteed only by adjusting planting structures，special attention should be paid to the overall planning and coordination of water resources，energy，food，and economy，so as to prevent the case that the rigid constraints of water and soil resources impede regional high quality development；meanwhile，priority should be given to water conservation，and the water resources governance and protection work in major grain yielding regions should be well managed.

Key words: food security, computable general equilibrium（CGE） model, high quality development, water resources, cultivation structure, resources and environment