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The data mining approach of rough set theory is being adopted to study the multi-index question of supplier’s evaluation and determination in order to reveal the determining rules hidden in the historical evaluative data. After introducing some basic notions of rough set theory, this paper uses a sample to tell the steps of the deducing process in detail, and figures out some satisfying rules of supplier’s determination and weights of various attribute’s indexes which have been compared to other methods after the calculation. All of these illustrate the method of rough set theory can be used in the area of supplier’s selection and solve them with great efficiency.