Abstract: With the development of computer technology, the information integration begins to be the key part of the enterprises information system development. As the basis of the whole application integration, database level integration plays a very important role in the whole information architecture. The key points of the heterogeneous information integration application were summarized in the paper. The principle and technique detail of information integration technology were analyzed by taking IBM DB2 Ⅱ v8.2 as an example. At the last, how to apply the information integration technology to diqital campus information integration practices was described.