Aim To focus on the concept description and fault diagnosis knowledge representation, acquisition and generation for complex mechano-electronic-electronic systems.

So data mining for a paging system user database in Guangdong province is presented by concept description method.

The method used the data source concept description to hide the physical properties of heterogeneous data source,providing data with natural semantics and reduced data association relation set for business personnel,and realizing the consistent access to data.

To solve these problems, the "basic concept descript frame" and a way of presenting conceptual model are proposed by XML which based on this frame.

E-mail classification based on concept vector space model;