Abstract:When the traditional GIS spatial analysis model is used to plan an urban earthquake evacuation scheme, the equivalent length of the evacuation path is not taken into account, and the evacuation efficiency of the obtained model is relatively low. Therefore, a new optimal evacuation model for urban earthquake disaster mitigation and relief has been designed. The equivalent length of the evacuation path was obtained by using the difficulty coefficient of passage, interfe-rence coefficient of secondary disaster, coefficient of bridge obstruction, and minimum equivalent length of evacuation path, all of which were obtained by objective function. Simultaneously, the new model accounted for the capacity requirement of the shelter, the emptying of personnel from the shelter, and the evacuation distance being less than the radius of service of the shelter. The experimental results showed that the new optimal model can give an accurate evacuation path and scheme, and efficiently accomplish the evacuation task of urban earthquake disaster mitigation and relief.