The rapid development of the subway contributes to public transportation, but at the same time the emergency evacuation of subway traffic puts forward higher requirements. At present, most of the studies on the emergency evacuation of the subway have neglected the differences in the mobility of different people in the subway stations, those studies are running out of time. In this paper, the evacuation population is divided into four categories to evacuate separately. Combining the theory of congestion, the relationship between different initial congestion degree and total evacuation time is obtained using dynamic programming method. The results show that when the population with different speed is evacuated separately, the optimal initial congestion degree exists and total evacuation time can reach minimum.
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