Research on Supply-Chain Supplier Selection Based on TOPSIS Method with Interval Number and Unknown Weight

For the problem of supply-chain supplier selection based on unknown index weight and interval number for index attribute, first, this paper constructs the Index system for supply-chain supplier selection based on the concerned literatures; Then, it transfers interval number decision-making matrix Into leave degree matrix and gets the objective weight of Interval decision-making matrix through using entropy method to draw out the weight of leave degree matrix; Furthermore, making use of TOPSIS method to calculate the distance between each supplier and ideal solution and negative Ideal solution and calculate the relative approximation, meanwhile determine the order of suppliers according to the relative approximation; Finally, It indicates the validity of evaluation system and evaluation method combining to a case.