At present, the separation of motor vehicle lane and non-motorized vehicle lane of road traffic, and the replacing of guardrail with greening of the road traffic are greatly been proposing in China. More and more new and reconstructed roads are of three-road or four-road types, and have the independent non-motorized lanes. Against this background, relying on an road reconstruction project and based on the sponge city concept, the design methods of non-motorized lane cross slope to the inside slope of the road convenient for the motor and non-motorized vehicle separator to collect the rainwater of non-motorized lane and sidewalk for cultivating the soil are proposed. The principle, the detailed design method and the promotion significance of this design method are expounded.