The theoretical model of traffic capacity of highway bridges after strong earthquake is an important basis of fast assessment technique of the capacity.This paper introduce the importance of traffic capacity of highway bridges for emergency rescue decision-making after earthquake.Based on the analysis of the traffic function loss of highway bridges after earthquake

the damage degree was defined and the damage index was revised.From the perspective of traffic engineering

this paper studies the theoretical traffic capacity of highway bridges and analyzes the factors of influencing the actual traffic capacity of highway bridges after earthquake.Then the passage probability of highway bridges after earthquake was deduced and the earthquake correction factors for traffic capacity of highway bridges was defined.Accordingly

the theory etical model of traffic capacity of highway bridges after strong earthquake was established.By aproject example

the effectiveness of the model is confiemed.