Abstract: The importance of the relevant highway section of the emergency rescue network is evaluated in this paper, which has a great value in the emergency traffic plan, command and control and other transport services In this paper, a new algorithm thinking is proposed and the algorithm model is established in views of some defects of the current studies First, the matrix algorithm of the complex transportation network connectivity map is designed to find the network of the biggest connectivity map among the multiple accidents and multiple rescue points Second, the network model GERT(Graph Evaluation and Review Technique) is established based on the network of the biggest connectivity map.The probability selection model based on human reason and experience is designed in views of human choices of highway sections So it can display human traffic psychology and behavior, especially emergency traffic psychology and behavior.Finally, the concept of the importance and its degree is defined and the model of importance degree is established based on the network of the biggest connectivity map which removes a certain highway section.Based on this model, the practical regional transportation network is taken as an example and its algorithm is verified and effective.

Key words: emergency, traffic network, highway section, importance degree, GERT network