Abstract: In the actual situation，each object is often assigned membership degree and weight to reflect its fuzziness and its importance.These objects form a special decision table.In this paper，the special decision table is studied，and the relevant rough set model is provided.In the meantime，the relevant definitions and the relevant theorems are proposed.On the above basis，an attribute reduction algorithm is presented.Finally，feasibility of the relevant rough set model and the presented attribute reduction algorithm are verified by an example.

摘要： 在实际情况中，为了体现对象的模糊性和在决策中的重要性，往往给每个对象赋以隶属度和权重，这类对象就构成了一个特殊的决策表。对此类决策表进行了研究，给出了相关的粗糙集模型、定义、定理，并在此基础上提出了一个属性约简算法。最后用实例验证了所给粗糙集模型以及属性约简算法的可行性。