Abstract: With the popularization of information technology and the development of Web technology, it has become a challenge how to use unified XML information description standard to define the data from various sources as most of the data information in the early mining systems are relational data. The conversion between XML data and relational data is studied and a data interactive access between relational data and heterogeneous data sources has been realized, providing a solution to a Series of practical problems and being of practical value.

Key words: Data conversion, Relational data, XML, Mining information