Abstract: It was explored the mix proportion design method for porous concrete based on void ratio control． The process and key points of mix proportion design were described by comparison with the mix proportion experiments． This method was verified to be convenient and practical． Besides，it’s effective to control the comprehensive performances of porous concrete． According to the analysis and comparison of influence of void ratio and water-binder ratio on compressive strength，void ratio was defined to have a more significant influence on compressive strength，while the effect of waterbinder was less． Moreover，this paper also analyzed the reason of void ratio deviation generated in the process of vibration molding method． Proposal was made to measures for decreaseing the void ratio deviation．