National Taiwan University (NTU) is one of the oldest universities in Taiwan and hence possesses a lot of rare books, historical texts, and precious documents. However, the access of these collections seems unfortunately to be limited only to the minority of related researchers inside the campus. This is against the overwhelming trend of information resources sharing. The best way to render these collections available to users all over the world in a more efficient way is to distribute these valuable collections via the powerful WWW. To achieve this aim, NTU Digital Library/Museum (DL/M) Group needs to digitalize these collections and establish metadata for them. This article describes the importance of metadata in digital library, gives a brief introduction to the development of NTU DL/M project, the system architecture of metadata in NTU DL/M project, and finally raises some problems which need to be solved as well as the future development of metadata in NTU DL/M project.