The invention relates to an urban inland inundation 
intelligent modeling and 
analysis method based on a GIS and an SWMM. The method comprises the following steps: constructing a 
simulation system based on the GIS and the SWMM; carrying out automatic preprocessing on the model data and automatically identifying topology errors; calculating a hydrological-hydrodynamic 
coupling model based on the SWMM by combining rainfall, calculating the amount of rainwater converged into a drainage 
pipe network 
system, simulating to obtain actual condition information in the drainage 
pipe network, and obtaining 
pipe point overflow data; performing 
surface water inundation analysis according to the pipe point overflow data, simulating the 
surface water to obtain the depth of the 
surface water, and distributing the surface 
water flow based on a window method; performing early warning analysis on waterlogging of surface water, comprehensively considering prediction of the surface water, automatically dividing waterlogging risk levels of different areas according to a calculation result of a hydrological-hydrodynamic 
coupling model and a result of surface water inundation analysis, and providing an early warning scheme for drainage waterlogging prevention emergency. The method has the advantages of being low in construction cost, high in model 
construction automation degree and accurate in analysisresult.