This article is a study on methods of digitalization for older oriental books using XML(eXtensible Markup Language) proposed as a standard for Web documents by W3C in 1996. In this paper, to digitalize older books, I designed the XML DTD(Document Type Definition) for general older oriental books and input the texts of the older books on the basis of the XML DTD, examined the problems and limitations in light of the technical level these days, and established the model of the system for using XML files of older oriental books at a national level in the future.