The research progress of seepage stability of rainfall-induced accumulation landslide both at home and abroad is reviewed from the aspects of unsaturated rainfall infiltration characteristics, evaluation methods of stability for accumulation landslide and instability mechanism of rainfall-induced accumulation landslide. In view of the deficiency in the study of seepage stability of rainfall-induced accumulation landslide, it is pointed out that the geological structure characteristics should be clarified. The coupling mechanism of seepage and runoff and the interaction mechanism of seepage-geological structure-mechanical parameters should be further investigated. The study of the dynamic disaster mechanism for rainfall-induced accumulation landslide should be strengthened and the safety evaluation method of rainfall-induced accumulation landslide should be improved in the future.