China is one of the main origins of rice cultivation, a country with an ancient history of rice cultivation, and a large rice production country. China is also a strong country in rice science and technology. The "green revolution" of dwarf rice breeding in the world originated in China, and China's hybrid rice is even more famous in the world. Rice is the main food crop in China, and also one of the important commercial grains in China. The sown area and total output of rice rank in the forefront of food crops, the sown area ranks in the top among rice producing countries in the world, and the total output ranks in the top of the world. The rice planting area in China is basically stable at 30 million to 31 million hectares, with a total output of about 20000 tons and a unit area output of 6300 to 6500 kg/ha. The sown area accounts for 20.2% of the total grain area, and the output accounts for 43.4% of the total grain output. Because of the stable rice output, it plays an important role in China's grain production.