Study on the Simulation and Evolution Model of Unexpected Emergencies’ spreading Network

The cycle characteristic of unexpected emergencies’ spreading is quantitatively characterized by Gaussian distribution, and Systemic Science is combined with complex network theory to constructs the evolution model of unexpected emergencies’ spreading from the two dimensions of spreading object and event subject so as to study the evolution of unexpected emergencies’ spreading network. By comparing the resolving results with the simulating results, the feature of unexpected emergencies’ spreading network which is in accordance with scale-free network's characteristics of γ=3 is founded which reflects the objective characteristic of unexpected emergencies’ spreading network, so that it means a lot for the emergency department to make “Scene-In response to” control strategy.