Due to abnormal weather, rainfall is often prolonged or temporary.Very little rain, negligible rainfall for a long time almost all year round, this is a common situation in arid and semi-arid areas.It does not rain very little, but in a certain period of time it did not rain or it just met the minimum needs of production and the surrounding environment.Drought has a great impact on the environment, economy, socio-politics and human health.Drought is the cause of poverty, disease and even war due to water conflicts.We need to use water resources appropriately in production as well as in daily life. In production, especially in agricultural production, water saving needs to be done in all 3 aspects: rational irrigation planning, building fields capable of increasing soil water retention and selecting varieties. Crops are more resistant to drought. Constructing new reservoirs with appropriate capacity to increase exhausted flow for river systems.