中小型水库的流域面积和库容均比较小，预报洪水具有江流速度快，预见期短等特点，所以要求预报准确快速。中小型水库的预报方法多是将入库出库流量过程概化为三角形，这样处理与实际情况不完全相符，导致预报产生较大误差。因此。研究改进中小型水库的预报方法是非常必要的，从而达到适用性强，计算速度快，预报精度高的目的。 Small and medium-sized reservoirs have relatively small drainage area and reservoir capacity. The forecast floods have the characteristics of fast river flow and short-term forecast period, so the forecast is accurate and fast. The prediction method of small and medium-sized reservoirs mostly summarizes the flow of incoming and outgoing reservoirs into a triangle, so the treatment does not exactly match with the actual situation, resulting in large errors in forecasting. therefore. It is very necessary to study and improve the prediction method of small and medium-sized reservoirs, so as to achieve the applicability, computational speed and forecast accuracy.