Abstract: Flooding and short of water resources is becoming more and more serious problem because of fast urbanization. In situational analysis, four layout of Green Stormwater Infrastructure(GSI) were put forward by evaluating their hydrology using Storm Water Management Model(SWMM). It is proved that GSI such as green roof and water garden can be used to reduce runoff of stormwater and increase storage capacity of rain. But their performance is still limit so that should be combined with drainage system. Also SWMM can help to optimize the layout of GSI.