Abstract: Termination Mechanism is the last indispensable section of the whole process of emergency management.Even if the governors have realized the importance of termination,it is much possible for them to choose wrong time to terminate emergency managemet which will cause huge damage.To solve this problem,this paper intends to build a mathematical model based on Optimal Stopping Theory,and then discusses some improvements of this model.Finally,Optimal Stopping Theory is applied to the dynamic decision making of emergency management.

Key words: optimal stopping theory, termination mechanism, time point, dynamic decision making