Abstract: Based on hydrodynamics principle，the model for the dynamic resource of the urban road network is proposed in this paper.The resource of Shanghai urban road network is displayed visually with GIS（Geographical Information System） and the information from ITS（Intelligent Transportation System），then the bottleneck of the urban road network is analyzed from the view of urban dynamic road resource.Based on the dynamic urban traffic information from ITS and the model，this paper evaluates the traffic condition of the road link，results show that the condition of the branch road in Shenzhen city is in accord with design standards and that of the arterial road is not in good condition.