Based on similarity rough set technique,the paper proposes a case selection algorithm that can use Discernible Matrix efficiently,search and deal with the redundant information as well as choose suitable cases to be deleted.

• 相似粗糙集技术可以有效地利用差别矩阵,通过不同的相似度阈值发现以及处理案例库的冗余,有选择地删除多余的案例;