In order to choose the optimal mine laying operation plan and judge the weight of each index before performing mine laying operational task. First, based on set pair analysis and information entropy weight, the evaluation model of the mine laying plans is made. Then, the method gains the weights of evaluation indexes by calculating the entropy in order to form the optimization matrix. Finally, the optimal mine laying operational plan is chosen after the plan candidates being ranked by comparing the degrees of identities. It is a practical method and it could reduce human factors in the weight calculating.