Abstract: Inview of the disadvantages of the existing rule acquisition method of dominance decision-making information system, such as small number rule acquirement or low rule accuracy, the decision discernibility set and discernibility matrix are defined, and an attribute reduction method of dominance decision-making information system is prsented. The rough set method based on dominance relation is applied to rank the objects, and then eliminate the unreasonable object compared with the decision attribute, and then the inconsistent dominance decision-making information system is transformed to the consistent one. The rule acquirement method of the consistent dominance decision-making information system is proposed, which conforms to the natural reasoning process and has strongly intuitionistic characteristic. The proposed method fully digs the information from the system and ensures the validity of the rules. This rule acquisition method is applied to radar target threat assessment, which is simple and feasible, and provides a new train of thought to solve the decision problem of which attribute contains “preference information”.

Key words: system assessment and feasibility analysis, rough set, attribute reduction, dominance relation, rule acquisition, threat assessment