Abstract: Due to inadequate information,incomplete data in evaluation of supporting schemes for slope,and the complicacy and uncertainty of the evaluation for slope and the fuzziness of human thinking,the evaluation value of the scheme is difficult to be expressed, the value represented in triangular fuzzy number is more reasonable. In order to solve the optimization of supporting schemes for slope with triangular fuzzy numbers,a comprehensive evaluation model based on triangular fuzzy numbers of connection numbers of set pair analysis is proposed. First the triangular fuzzy numbers are transformed into connection numbers by using the median, and the interval of value prescribed by supremum and infimum of the triangular fuzzy numbers, depend on the connection numbers theory of set pair analysis; then, the decision-making model of connection numbers is established based on the definition of addition and multiplication of connection number,and the optimum schemes can be obtained by the comprehensive decision values. The median and the supremum and infimum of the triangular fuzzy numbers are used in this model; it is more objective and reasonable. A practical example indicates the method is simple and credible.