The frequent occurrence of extreme weather worldwide and the rapid expansion of underlying impervious surfaces lead to the continuous increase of urban rainwater runoff. With the proposal of the concept of Sponge City, the regulation effect of low impact development (LID) rainwater system on urban rainwater and flood has been paid attention to. Taking the cherry blossom garden construction of Shandong Jianzhu University as an opportunity, this paper attempts to integrate the selection, system construction, landscape treatment, and implementation of sponge measures into the whole process of design and construction, quantitatively checking the scheme by using SWMM model and compare and select the optimal lid facility combination and scale. The results show that under the return periods of 1 a, 2 a, 5 a and 10 a, the peak reduction rates of lid facilities to the system are 23.35%, 23.42%, 23.18%, and 23.10%, respectively, and the peak time is delayed by 2 min, 3 min, 5 min, and 7 min respectively. The simulation data show that lid facilities can effectively reduce the surface runoff and peak flow, delay the peak time, and achieve an effect basically consistent with that before development and construction. Actively seek the intersection of rainwater and flood management and garden landscape, landscape sponge facilities, and carry out a functional and landscape sponge green space construction practice with the strategies of diversified combined permeable pavement, natural dry stream open drainage ditch, fine planting rainwater garden, and functional composite reservoir.