The present situation and change trend of food supply in China are studied in this paper. The study shows that the degree of self-sufficiency in food in China is still at a high level in general, but it has a downward trend in recent years. The difference between different products is also obvious. The decline of oil crops is obvious and the grain is basic self-sufficiency. The main causes of this change are the growth of China's economy, the short supply of food production and the small-scale operation model. The market and policy factors also have a certain impact. In recent years, the grain production in China has shown an increasing trend year by year. But in contrast, the number of grain imports in China is also increasing. Not only food, such as meat, milk and other products are also in many imports. This phenomenon has aroused people's thinking. Is the food production in our country self-sufficient, and whether the national food security has a hidden danger? At present, most of the research on food supply is focused on food, especially grain. There is not much research on other products and less overall research. In addition, many studies are based on domestic statistical data, focusing on production and import and export data, and less on the impact of inventory changes. With the rapid development of China's economy, people's living standards have been greatly improved, and more and more kinds of food are consumed. Therefore, based on the development and change of social economy, we must have a broader perspective to study the food supply problem, and study the whole food field. And, in a broad sense, food is included in all food. With the increase of grain output and the import of various kinds of products, the quantity of stock will inevitably be changed. If we do not make a comprehensive investigation, we cannot accurately predict the supply of food in China, and then affect the food security of our country.
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