Taking mountainous rainfall-induced landslide in Fujian province as the study subject,combining indoor artificial rainfall landslide experiment with finite element numerical simulation method,the mecha-nism of rainfall-induced landslide of highway bank slope has been studied in this article.The water slope failure mode and causes of stability have been discussed with the effect of reservoir water level fluctuation and the changes of rainfall intensity on highway bank slope.The research shows that the seepage field a-long the slope body has been changed,and the mechanical strength of soil has been reduced.The anti-slide force in front of slope will decrease with the sliding force increasing caused by buoyancy weight loss and soaking softening,and the sliding force in the rear of the slope will increase.This will lead to landslide.%以福建山区库岸公路滑坡为对象，采用室内模型试验和有限元数值模拟方法，研究库岸公路降雨滑坡形成机理，探讨库水位下降与降雨联合作用下导致临水边坡发生失稳的模式和原因。研究表明库水位变动与降雨的联合作用将改变沿坡体内的渗流场，降低滑坡土体的力学强度，使得滑坡前缘由于浮力减重和浸泡软化作用导致抗滑力减小，滑坡中后部下滑力增大，产生滑坡现象。
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