"Butterflies of Taiwan" is a sub-project under Taiwan Digital Museum Project(TDMP), sponsored by the National Science Council of Taiwan. "Butterflies ofTaiwan", a cooperative project, was proposed by National Chi-Nan University andNational Museum of Natural Science; its metadata was developed by Resources Organization Searching Specification (ROSS, also a sub-project under TDMP) ResearchTeam. In order to design the appropriate elements and create the butterfly metadata,ROSS started to gather relevant information on butterfly and information cataloging inAugust 1998. The main purpose of this project is to establish a digital museum tosupport and promote science education. Task of ROSS is the following: with respect toinformation storage and retrieval demand, to develop butterfly metadata format anddesign system specification based on the project content. This article presents the metadata format created for butterfly project and discusses issues related with its implementation. In order to promote information exchange, mapping of butterfly metadata toDublin Core will also be presented.