Features of the materials database system for plant facilities management are discussed here. Korea Electric Power Research Institute (KEPRI) has developed web-based materials database system for power plant engineers with an aim to give them the integrated materials information which is needed in solving material-related problems frequently occurred in plant maintenance activities. The materials database system contains more than twenty thousands material standard data of eight countries including chemical composition, mechanical properties, and their applications in the power plant facilities. Using the system, users can find useful information of equivalent material standards and physical or chemical environments where the material is applied. Integration of material data with facility data is expected to give more valuable information to plant engineers in solving their material related problems. The database system also adopted state-of-arts extensible markup language (XML) technology and was designed to share its data easily with other information systems such as plant engineering expert system, materials management system, enterprise resource planning (ERP) system and so on.