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中文摘要：
基于优势关系的序信息系统，将粗集属性代数观（属性对论域中确定分类子集的影响）和粒度观（属性对于论域中不确定分类子集的影响）有机集成，计算优势关系下一种新的粗集属性重要度，构造最优权重．将该方法应用于农产品生产价格指数综合评价，结果表明该方法可行，且评价结果既符合客观实际又反映主观要求．
英文摘要：
The classical rough set theory is established based on the equivalent relation, but for the information systems containing numerical attribute value triust be discredited first, resulting in loss of information. The weights based on the concept of algebra （the influence of the attribute to definite classification subset ） and the concept of granularity （the influence of the attribute to indefinite classification subset ） are carried on the organic integration based on dominance relationship. To computer a new attribute importance in rough set, providing an optimal determining weights method. The method is applied to agricultural PPI, which shows that the method is feasible, and makes the evaluation results consistent with objective evaluation information and meet the requirements of decision maker.
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