In order to study the effect of aggregate factors on the performance of porous ce-ment concrete， three kinds of single diameter of basalt rock and pebbles， 9.5~13.2mm，13.2~19.0mm， 19.0~26.5mm， as well as three kinds of particle size aggregate in differ-ent dosage conditions were studied.The CTscanning， simple water permeable instrument and other technical means were also used to obtain the porous pore size and po redistribution ofporous concrete， and its permeability.The results show that under same conditions， the effective porosity of the gravel porous concrete is 3%~4%higher than that of the pebble porous concrete.With different particle size， the lowest compressive strength of gravel por-ous concrete is 7%higher than the pebble and the highest compressive strength ofgravel porous concrete is 9%higher than that of the pebble.Compared with pebbles， gravelsur-face is rough， rich of micro-texture， and the capacity of bonding cement paste is stronger，so the gravel porous concrete compressive strength is higher.