Abstract: The stress-strain-permeability behavior of artificial specimens with different pore proportioning was investigated electrohydraulically by servo-controlled MTS 815 rock test system. The influences of pore proportioning, porosity and seepage on rigidity and peak strength of artificial specimens were systematically studied by comparing testing results. The relationship between pore proportioning, porosity and permeability was thus obtained to set up an equation expressing how the hydraulic pressure and porosity weaken the rigidity and peak strength of artificial specimens. A reference was therefore provided to describe quantitatively the relationship between rock's porosity, permeability and peak strength. Experimental results showed that the coarse particles in proportioning and macro pore affect obviously the porosity and initial permeability and water weakens the rigidity and strength of specimens more significantly with increasing porosity.