Aimed at densely fractured rock masses, the paper sets up the saturated unsaturated seepage flow mathematic model for atomized rain infiltration using equivalent continuum theory. Atomized rain strengths are selected according to the model experiment. Combined with natural rainfall, numerical analysis on atomized rain infiltration in fractured rock slope is conduced. The results show that pore water pressure increases quickly and transient saturated zone which is disadvantagous to the slope stability is easily formed in great storm zone, relative to thin frog zone and natural rainfall zone. So slope surface protection and inside bailing within great storm zone should be emphasised.
