This research aims at construction of the technology which can carry out sharing of the material databases built in domestic and overseas as common property. The existing material databases are built by an original concept and an original technique, and they are not premised on sharing. To predict life of materials with the material database, it is difficult to use the databases for cooperation and utilization on the analysis system which a user has. Then, we used the data description language XML (eXtensible Markup Language) on the Internet as a common description language of material database description, and tried life prediction of material. The method is to carry out XML description supposing the material property data from some material databases with a different data structure. And the material property data were used. The described material property data are creep rupture data. In life prediction of materials, those data required for analysis, such as the test temperature, test stress, and time to rupture were extracted from the creep rupture property described in XML with XML application. Consequently, 1) creep rupture data were structured in hierarchical order by XML, and it was used as alanguage of description. 2) Data required for analysis were extracted by the XML describing method and XML application. 3) In data analysis, individual data analysis or strength comparison with a different data structure was conducted. Therefore, the method of using XML can treat data with a different data structure, and XML utilization is a promised way as a technique for sharing of a material database.