The main factors affecting maize yield are maize planting area, technical application, industrial policy, market price and so on. The main factors affecting corn consumption demand are population, feed demand, market price and industrial development.

Through the analysis of two factors, we can draw the following conclusions:

1) China's corn is basically self-sufficient. China's energy, technology and production capacity can ensure the basic self-sufficiency of corn, and it will not become a major corn importer in the world.

2) Insufficient supply will be a long-term trend, which is determined by the basic development of China's population and economic growth and the limitations of improving supply capacity.

3) The corn price in China will be further in line with the international market price, and the price difference with the international market will gradually narrow, which will be more and more affected by the relationship between supply and demand.