1. Cross Shanhaiguan, go south along Taihang Mountain along the Great Wall, cross Taiyue Mountain and Luliang Mountain, and reach the north of the northern foot of Qinling Mountain in Shaanxi Province. Including all of Heilongjiang, Jilin, Liaoning, Ningxia and Inner Mongolia, most of Shanxi and parts of Hebei, Shaanxi and Gansu are spring-sown corn areas in northern China.

2. Jiangsu Dongtai, along the Huaihe River from Anhui to Henan, along the Qinling Mountains into Shaanxi to Gansu Province, including all of Shandong and Henan in the middle and lower reaches of the Yellow River, Huaihe River and Haihe River basins, most of Hebei Province, south-central Shanxi, Guanzhong and Xuhuai areas, is a summer maize planting area in the Huang-Huai-Hai Plain of China.

3. Sichuan, Yunnan and Guizhou, southwestern Shaanxi, hilly areas in western Guangxi, Hunan and Hubei, and a small part of Gansu are all mountainous corn areas in southwest China.

4. It is connected with the summer sowing corn area in the Huang-Huai-Hai Plain in the west, the intercropping corn area in the southwest mountainous area in the west, and the East China Sea and the South China Sea in the east and south frequently. Including Guangdong, Fujian, Zhejiang, Jiangxi, Taiwan Province and other provinces, southern Jiangsu and Anhui, eastern Guangxi, Hunan and Hubei are hilly corn areas in southern China. Hexi Corridor, including all of Xinjiang and Gansu, is the corn irrigation area in the northwest of China. Northwest irrigated corn area is the corn area of Qinghai-Tibet Plateau in China.