In order to formulate a passenger evacuation scheme under emergent situations, this paper proposes a simulation method of emergency evacuation from terminal departure hall. The core philosophy of this method is that: first, develop physical environment for emergency evacuation based on the actual layout of the terminal departure hall, determine core simulation parameters through investigating passengers’ behavior characteristics, and analyze passenger affairs process under normal situation and emergency evacuation, then, based on social mechanics theory, use Anylogic software to implement the simulation passenger emergency evacuation scheme and calculate the total time consumed. During the simulation experiment in Mianyang airport, it is found that during the evacuation, the emergency exits and security check channels are over congested. Hence an optimized scheme is proposed, and the average service level of which has been improved according to the simulation results.