The purpose of this paper is to discus the transition of Taiwan’s information and electronic companies, and explore the relationship between companies and industries through plotting out patent citation maps. The fifty-nine companies studied in this paper, obtained 5513patents from U.S. between 1992 and 2000, and they cited 32,945 patents during these years. The research methods of this study include literature review, database retrieval, and used cluster analysis and multidimensional scaling to plot out patent citation maps. The result of this study shows that a higher similarity among companies in semiconductor sector, and the relationship between companies is getting closer. In addition, the distinction between industries grows more and more ambivalent, even overlapping in some cases.