This study takes flood-prone low-lying catchment areas in the urban areas as the research object, with the purpose of clarifying the site of the research object that has a higher demand for the introduction of green infrastructure and investigating the possibility of introducing green infrastructure in this area and to quantitatively verify its effectiveness, in order to develop green infrastructure in conjunction with future urban flood control measures and solve problems in social implementation. First, using GIS, we visualized low-lying catchment areas formed by five levels of rainfall and extracted them as priority areas for the introduction of green infrastructure. Next, we summarized the characteristics of the catchment area by distinguishing the influence range, distribution characteristics, and land use status of the low-lying catchment area formed by the five level of rainfall levels, and clarified the key import objects and import degree of green infrastructure at each level. Finally, based on the above analysis, we propose a plan that phased introduction of green infrastructure in priority areas, and quantitatively calculate the effects of each phase. The results show that this method is effective in eliminating Inland floods with rainfall intensity of 40-100mm/hr.
