By means of rainwater infiltration test in soil column with perforated pavement and the model test of the perforated rainwater drainage pipes, rainwater infiltration utilization system is studied deeply. Some important effecting factors on rainwater infiltration are discussed, and the calculation formulas for rain water infiltration ratio and steady flow rate of perforated rainwater drainage pipes are proposed. The results indicate that the perforated pavement and perforated rainwater drainage pipe system reduce run off and replenish underground water remarkably.