The decision making of emergency material reserves is one of the key topics in emergency management，which needs to balance the people-oriented demand with the economical request．Based on the two-stage characteristic of emergency rescue，emergency material is divided into response material and recovery materia1．The demand of recovery material partly depends on the shortage of response materia1．A decision-making model is proposed considering this correlation．Then the properties of the optimal solution are ana1yzed．Furthermore，taking the substitution among recovery materials into account,the model is further improved．An algorithm is applied to solve it based on Monte Carlo simulation．Finally， numerical examples are provided to illustrate the influence and significance of correlation and substitution on decision making of emergency material reserves．