In this paper, we show how to use fuzzy inheritance to extend the conceptual level of thedatabase triple structure. The process is to create a common project of all information retrieval system' sschemes without destruction of the independence of physical data. During retrieval, we convey the queryto each IR system by inheritance,and at the same time,the old IR system can be used too.%本文利用模糊继承机制，对数据库结构中概念模式进行扩展。在保证多个IR系统数据独立性基础上，形成一共同映射。检索过程中，参照共同映射将查询表达成继承式的传递到各IR系统，在这过程中，不影响各数据库结构的外模式。
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