A decomposing model of granular computing in decision information system is developed and an approach about the briefest rule acquisition is presented with adding gradually condition attributes.

• 提出了一种基于决策类逐渐细化条件粒直接获取最简规则的方法。该方法不仅考虑了属性相对独立性，而且能更加充分地挖掘决策表中的知识，并用实例验证了其可行性。