Abstract: By improving the traditional TOPSIS method and incorporating the Monte Carle simulation,a new method for multi-attribute decision-making with decision information such as attribute weight and attribute value in the form of interval numbers is presented.A new decision-making index is defined considering the concept of structural reliability,and all alternatives are to be ranked according to the decision-making index.Finally,a simple investment problem as an example is given to illustrate how to use the proposed method in engineering.