On the basis of GIS, the methods of flood criticality regionalization are studied by use of overlay analysis of polygon and cluster analysis.And then the flooding risk is mapped.

• 在地理信息系统平台上，采用多边形叠置分析和聚类分析等手段，研究洪水灾害危险程度区划的方法，进而绘制成洪水风险图。