The proportion of pervious concrete bricks is designed by using orthogonal method.The effect of a series factors(the aggregate-diameter,water-cement ratio,aggregate-cement ratio)and different proportional levels to the indexes are analyzed by taking concrete strength,water pervious coefficient,percentage of interconnection voids as indexes.It is proved that favorable agreement is found between analyzing result and experiment finding,so orthogonal design can provide the directions and methods to concrete mix proportion.The experiment has discovered the most superior allocated proportion under the controlled condition.