通过分析思贤的水流特征 ,从水文要素方面分析三水水文站河床下切的原因 ,提出根据思贤的特点 ,科学地防灾。 Based on the analysis of the flow characteristics of Si Xiangyuan, the paper analyzes the reasons of undercutting of riverbed in Sanshui hydrological station from the aspects of hydrology and puts forward that according to the characteristics of Si Xiangyan, it is scientifically prevented from disaster.