1. Generally, the slope of hills is low, cut and broken, with no definite direction, no obvious veins, and the top is round, which is the product of long-term erosion in mountain areas.
2. China mainly includes southeast hills, Jiangnan hills, Jianghuai hills, Zhejiang and Fujian hills, Guangdong and Guangxi hills, Shandong hills, eastern Liaoning hills, central Sichuan hills and loess hills, with a total area of about 1 million square kilometers.
3. Hills are generally distributed in mountainous areas or the transition zone between plateau and plain. The hilly area has abundant rainfall, which is suitable for the cultivation and growth of various economic trees and fruit trees, and is very beneficial to the development of diversified economy.