The present invention discloses a method for defining a metropolitan area based on a regional inter-city flow intensity measurement model. The method includes the following steps: 1. determining an urban agglomeration regional range to be measured and inter-city flow associated cities; 2. measuring, according to the determined associated cities, itemized regional inter-city flow intensities of each group of the associated cities, where five items, namely, economic flow, passenger flow, freight flow, technical flow, and information flow are included; 3. calculating through weighing, according to the five itemized regional inter-city flow intensity values, integrated inter-city flow intensities and membership degrees thereof between a central city and other associated cities; 4. recording the above data into an ArcGIS library, and establishing a regional inter-city flow database through association between spatial data and table data; 5. performing four groups of naturally intermittent type clustering analysis on data in the established regional inter-city flow database, and finally determining the range of a metropolitan area in a narrow sense and in a broad sense. By using the present invention, city linkage intensities can be measured quantitatively and comprehensively in a multi-factor mode, and accordingly the multi-circle range of a metropolitan area is defined.
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