Based on changing trend of Chinese corn overall demand trend and demand structure of the,the trend of Chinese corn supply and demand was estimated using the forecast method of average growth rate.The results showed that by the year 2020,China domestic corn consumption was about 260 million tons,feed consumption was about 177 million tons,food and other consumption was about 76.26 million tones.China has 0.37 million hm² corn planting area,250 million tons corn production,and 6855 kg per hectare.Even so,there will be an approximate 10 million tons gap between the supply and demand.The main conclusion was that Chinese corn tight balance will become the normal state,and the growth of industrial corn demand should be continuously limited.As population growth and cultivated land and water shortages,we had little room for expand cultivated land to increase corn production.At the same time;corn yield in China was also higher than the world average.Only by combination of technical progress with the improvement of agricultural production conditions,or with increase investment of agricultural infrastructure,the corn output will possibly raised.