The applications of stochastic decisionmaking to meteorological service are in troduced primarily in two cases.The first case study shows that the meaning of s tochastic decisionmaking is uncertain when the probability of high impact weat her event is uncertain. In this case, the optimistic, pessimistic, or minimum re pentant value (MRV) decisionmaking can be chosen respectively according to the risk preferences of service. The second case shows that it is a certain meaning of stochastic decisionmaking when the probability of high impact weather even t is known. In this case, the best scheme could be setup up by the maximal expec tation value (ME) to provide meteorological service. Sensitivity analysis of sto chastic decisionmaking could be transformed as a mathematic question about calculating the critical probability and figured out d irectly by using graphical method.