Abstract: As a non-engineering measure, hydrological forecasting plays a more and more important role in flood and drought prevention, comprehensive utilization of water resources and national economic construction.This paper reviews the research progress of watershed hydrological forecasting in recent years, combs the concept of watershed multi-scale hydrological forecasting, summarizes the key technologies, problems, developments of multi-scale hydrological forecasting, and focuses on the uncertainty factors and the mismatch of hydro-meteorological coupling in hydrological forecasting.Finally, based on the analysis of the applicability of watershed hydrological forecasting, this paper emphasizes the importance of considering the applicability of hydrological forecasting in operational practice of different forecasting period, and puts forward the guiding principles and suggestions for expanding multi-scale hydrological forecasting under current conditions.