Abstract: Food security bears on the revival and power of our country,and structural food security is an important means to ensure food security.Only by solving the food and clothing problems,especially ensuring food security for our country's 1.4 billion people can we maintain long-term social stability.The current situation of food supply and demand at home and abroad,at different domestic regions,and of food varieties shows that food security in China is in a state of "tight balance".The rapid urba-nization and population aging have brought an obvious trend of healthy and diversified food consumption and an imbalance between supply and demand of food varieties.Due to the limited land resources in the main grain selling areas and the difficulties to increase per unit yield,the main producing regions are facing great pressure to increase production,causing prominent imbalance of food supply in different regions.The closed-loop management of grain production,processing,transportation,storage and sales mainly depends on policy regulation,and the supply chain is not perfect.In addition,the intensified international situation against the trend of globalization,unilateralism and protectionism have made international food supply unstable,bringing great challenge for China's food import.Only by taking initiative to ensure food security and food import,optimizing regional supply and ensuring measures of food supply chain,can we solve the structural food problems in our country.

Key words: food, food structure, food security；grain production；grain reserves