Green roofs can miti gate city runoff and serve as a means of storm water management by storing and releasing rainwater in an effective way . Furthermore, by providing ecological habitats, absorbing noise and reducing air pollution, green roofs contribute to people’s health and compensate for distressed or lost ecosystems In terms of energy conservation, the combined effect of shading, evapotranspiration and thermal insulation make green roofs play an important role in microclimate modulation and building thermal performance improvement. The depressed temperature fluctuation of waterproof membrane helps to extend the lifespan of building materials