(2) North China is rich in light, heat and water resources. The high temperature season is a rainy period. Rain and heat are the same season, and crops are harvested twice a year and three times a year. It is a high-yield area of cotton and wheat in China. However, soil erosion in the upper reaches of the Yellow River and the Loess Plateau is serious, and drought and flood disasters in the lower reaches of the Yellow River in North China Plain are very serious. North China should focus on water control, waterlogging control, drought resistance and saline-alkali prevention, vigorously carry out engineering measures and biological measures, change the loss status of the loess plateau, improve the irrigation and drainage system, and achieve the effect of comprehensive control of drought, waterlogging and saline-alkali