In order to investigate theinfluenceofcrack network geometry on the permeability of cracked cement-based materials,cracks were artificiallymadein mortar and concrete slice specimens to obtain a two dimension(2D) crack network. The water vaporsorption isotherms (WVSI) of ordinary concretes and mortars were measured. The intrinsic permeability of specimens with differentlevels of cracking extent was determined via the mean relative mass based on the mass measurement during drying test, the WVSI andwater transport model. The geometry parameters on 2D cracked surface, i.e., crack density, orientation and crack openingaperture,were evaluated . The relationship between the geometry characteristics of crack networks and the relative permeability wereinvestigated. The results show that the crack density has animpact on the increase of the relative permeabilitywhenρis >0.3, whichisrelated to the percolation characteristics of crack networks. The mortar and concrete specimens bothhavea correlation between therelative permeability and crack opening.