The purpose of this study is to extract metadata based on Dublin Core from national construction information DBs, to design XML schema from the extracted metadata and to apply the previous works to integrated information retrieval system. To extract metadata, co-work was performed with librarians in the field of construction information, and. as a result, twelve metadata elements from Dublin Core and one administrative metadata could be extracted. Based on the investigation and analysis of those thirteen metadata elements, XML schema design process was described in detail. finally, the service environments of integrated information retrieval system to which XML schema was applied was introduced. Further study was also provided.