Reason: In recent years, the global soil erosion problem is very serious, which has threatened our human survival. After a natural class, our class set up an environmental protection group to investigate and explore soil erosion. Findings: The main reason is that most parts of China belong to monsoon climate, with concentrated precipitation and heavy rain. Geological and geomorphological conditions and climatic conditions that are prone to soil erosion are the main reasons for soil erosion in China. There are also a large number of steep slopes, which make the steep slopes poorer and poorer, a vicious circle of the ecosystem; Deforestation, even digging roots and lawns, leads to a sharp decline in trees, exposing the surface, causing soil along the river to flow into the river, raising the riverbed, causing floods, exposing the land, causing sandstorms, flooding the land, and turning the original oasis into a desert. In addition, some capital construction does not meet the requirements of soil and water conservation, such as unreasonable construction of roads and buildings, which destroys plants, reduces the stability of slopes and causes more serious geological disasters such as landslides, landslides and mudslides. Prevention: reduce slope runoff, slow down runoff speed, improve soil water absorption capacity and slope erosion resistance, and raise erosion datum as much as possible. When taking prevention measures, we should proceed from the area where surface runoff forms, follow the runoff movement route, adjust measures to local conditions, strengthen control step by step, combine prevention with prevention, and give priority to prevention; Slope control is combined with gully control, mainly slope control; Engineering measures are combined with biological measures, mainly biological measures. Only by taking various measures for comprehensive management, centralized management and continuous management can it be effective. More trees should be planted to prevent soil erosion. Don't let people cut down trees indiscriminately. Change the inappropriate places and add some more.