Fundamental technology for constructing digital archive of Origami and its applications Jun Mitani （Assistant Professor, Department of Computer Science Graduate School of System and Information Engineering , University of Tsukuba ） URL；http://mitani.cs.tsukuba.ac.jp/ I will construct a digital archive of Origami with the digitalization of crease pattern information of various foldings. Accompanies with this, I will develop a special editor for inputting the crease patterns of Origami and some applications such as calculating the folded conformations from the patterns. The retrieval methods and classification methods are realized by this research, and these can be useful tools for designing new works and other fundamental ones. Moreover, I will advance this research to the field of engineering, mathematics, art, and culture based on the theory of Origami.