Abstract: Flood forecasting is an important non-engineering means to prevent and reduce flood disasters. The continuous improvement of automatic measuring and forecasting system of water and rain regime has laid a foundation for the acquisition of hydrological information in flood forecasting. Precipitation is one of the key factors of flood generation,the development and application of precipitation forecasting technology provide new impetus for the development of flood forecasting. The hydrological model for flood forecasting explains the process of flood generation from the perspective of rainfall-runoff and so on,and enriches the methods of flood forecasting,the development of land-atmosphere coupling technology points out a new direction for further improving the accuracy and forecast period of flood forecasting. With the continuous development and improvement of the above technologies,the accuracy of flood forecasting is constantly improved. In this paper,the research progress of flood forecasting precision is systematically reviewed from four aspects:the research progress of automatic rainfall forecasting system,the application progress of precipitation forecasting in flood forecasting,the research progress of hydrological model of flood forecasting,and the research progress of land-atmosphere coupling model,the development direction and research hotspot of flood forecasting in the future are prospected. The automatic forecasting system of water and rain conditions needs urgently to introduce new theoretical technologies and non-contact equipment to increase the density and intensity of information. The development of flood forecasting and the application of artificial intelligence in flood forecasting research and practical work have already contributed to the development of flood forecasting technology. The breakthrough provides a strong support. The land-atmosphere coupling technology has developed from one-way coupling to two-way coupling based on physical concepts,and single-station observation and simulated meteorological data are driven to develop in the direction of combining remote sensing and four-dimensional assimilation,providing a reference for future research on improving flood forecasting accuracy. The research results can provide technical reference for hydrology and reservoir dispatching scientists.