The evaluation of roads damage and the traffic function state have a very important impact on the earthquake relief work. The decision-maker can make a better reasonable and effective earthquake relief strategy with a better understanding of the road traffic capability conditions. However,this question has long been plaguing scientists engaged in the earthquake disaster risk assessment. So far there is no better solution yet. To solve this problem,the authors develop a new method of rapid assessment of the traffic capacity(TC)mapping influenced by EIL using MDT. The method consists of three major procedures:①Customizing road section(RS). The RS is regarded as the basic unit of the TC evaluation influenced by EIL. On GIS platform,roads in the study area are divided into basic units,in which a buffer(180m)for each RS is created;②Calculating the number of each earthquake-induced landslide susceptibility level's cells on every buffer. The calculated results are taken as the RS's landslide attribute;③Using MDT to make TC map. To test our new model,four historical earthquake events,i.e. 2008 Wenchuan,Sichuan M_S8.0 earthquake,the 2014 Ludian,Yunnan M_S6.5 earthquake;and the 2012 Yiliang,Yunnan M_S5.6 and M_S5.7 double earthquakes,are selected for the case study,in which the Wenchuan earthquake case is for testing the effectiveness of our new model. The other two cases serve for testing the practicability of our model for the future earthquake disasters in other places in China. P-value and kappa coefficient were used to examine the model's statistical portability. The results show that the computed TC values are good indicators of blocked-road occurrences,and the MDT can be extrapolated to other study area and the developed approach can be used in various magnitude earthquake events.