[Objective] Exploring the variation process of seepage field and transient saturated zone of fractured rock slope under the influence of rainfall to provide support for the study of the law of rainfall infiltration, engineering technology and water conservation. [Methods] Based on discontinuous fracture network model, a Matlab program was designed to calculate the permeability tensor. Based on equivalent continuous medium model, a program using FISH language was designed for unsaturated seepage analysis. [Results] Permeability tensor of fractured rock mass was obtained through the engineering case. With the increase of rainfall intensity and rainfall duration, the surface of zero pore water pressure will extend to the inside of the slope and the scope of transient saturated zone will expand. Moreover, the appearance of transient saturated zone will occur in the case when rainfall intensity is greater than the the infiltration rate of the slope. [Conclusion] The characteristics of anisotropic and unsaturated seepage in fractured rock mass can be better elucidated by using discontinuous fracture network model and equivalent continuous medium model and the models can be used to analyze the rainfall infiltration of fractured rock slope.