For incomplete information systems, the concept of discernibility under tolerance relation was introduced. More⁃over, an attribute reduction algorithm in incomplete information systems based on discernibility was presented. Dependency relation between attributes can be known from the reduction gained by the algorithm. It is more suited to the needs of practi⁃cal application. An example was used to illustrate that the algorithm was feasible and more effective through comparison.%针对不完备信息系统问题，引入容差关系下分辨度的概念，并由此提出一种基于分辨度的不完备信息系统属性约简算法，该算法更符合实际应用的需要。文章通过实例比较，证明该方法可行、有效。
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