In order to study the influence of fissures on the seepage characteristics of slope soil slopes under rainfall conditions, numerical modeling was conducted using the SEEP/W module in Geo-studio, the influence law of seepage characteristics (e.g. volumetric water content, pore water pressure and transient saturation zone) of slope soil slopes with different fissure distribution under rainfall conditions was investigated. The results show that volumetric water content of the slope surface increased rapidly due to rainfall infiltration. The wet front gradually moved down as continuous rainfall, the moisture content distribution of the slope was significantly affected by the fissures. The fissures work as a rapid infiltration channels, causing that the change amplitude of the fissured slope is greater than that of the fissure-free slope. A transient saturation zone forms easily at the end of fissure, which will gradually expand and move down with the continuous rainfall until it connects with groundwater, causing the rising of groundwater.