The maintenance cost is rapidly increasing due to the increased of infrastructures such as railway and port etc., it is necessary management method of facility for measures and extend life. In the case of international infrastructure, in order to asset management to reasonably and effectively, asset management systems were developed for the management of facilities in various countries such as Australia and Canada etc. In this study, to develop the asset management process, the question investigation was conducted on maintenance site personnels for maintenance of the steel structure.