Abstract: The presence of more information doesn’t usually generate a corresponding increase.The rough set theory was introduced into evaluating the significance of the system parameters.The presence of irrelevant information will decrease the effectiveness of the algorithm.The authors proposed a solution to improve the quality,that is an attribute-weighted algorithm based on rough set theory.Firstly,The authors computed values for the weight of every attribute.Then combination of rough set and TOPSIS for comprehensive evaluation is described.The proposed method was applied in example and the result showed that it is effective.

Key words: rough set, TOPSIS, weight, comprehensive evaluation