This paper deals with laboratory investigation into Permeability of intact rock, natural facture rock under lower pressure (maximum test pressure is 20MPa). Four materials (granite, metamorphic rock, marble and cement block) have been tested in experiment by using six kinds of ways. Tile results show that permeability of intact rock under lower pressure is of 0.001 md magnitude and fractural rock is of 1 md magnitude, and rock permeability is clearly related to stress state and loading way.