Abstract: With respect to the problem of alternatives adjusting in emergency decision,a risk decision method is proposed.According to the characteristics of scenarios evolution in emergency event,the whole procedure of dynamic adjusting is firstly described,and the correlation between different alternatives is identified.Then,the generation of adjusting alternatives is described.Further more,some factors are also considered in this paper,such as the performance of alternatives,the loss during the procedure,the switching costs between the emergency alternatives and so on,and the dynamic adjustment method is given.Finally,an example is given to show the validity and feasibility of the proposed method.

Key words: emergency decision, dynamic adjusting, risk decision