Abstract: In order to rationally evaluate the traffic safety of expressway,an attribute mathematical recognition model was set up.In this model,the evaluation index system was built on the basis of analyzing the influencing factors of expressway traffic safety,the weight of each index was decided with five-scale method,and the evaluation result wag identified according to the attribute measure value of single index and the synthetical attribute measure value of multiple indices as well as the confidence criterion.The actual application of this model shows that the assessment result can provide scientific foundation for the planning and renewing of expressway.