The analysis of co-authorship in academic papers is a useful approach to objectively evaluate university-industry linkage which has been highly promoted nowadays. This kind of bibliometric research are mostly based on analyses of data extracted from the ISI's citation index databases, which are considered not to be sufficient for assessing research activities in Japan. In this study, we discuss on research network formation including university-industry research collaboration based on CJP database, produced by National Institute of Informatics.