Mass casualty is often caused by sudden public health events. The hospital emergency plan aims to provide timely and effective rescue for individual or group wounded outside the hospital and in the hospital, so as to save lives and reduce the damage for all kinds of public health emergencies. In this paper, the authors described their participation in the intra-hospital rescue of a highway traffic accident happened on 30 January, 2015 and pointed out the present situation of emergence plan and the related technical details in the process of the training, so as to improve the ability of the hospital to treat the mass casualty.