This paper provides an overview of the dimensional structure of bill cosponsorship networks in the Legislative Yuan from 1992 through 2012. This paper’s exploratory analysis presents two empirical findings. First, about one-fifth of the legislators’ bill cosponsorship activities can be explained by the Pan-blue vs. Pan-green cleavage. Second, the other dimensions are mainly responsible for the minor party members, who want to differentiate themselves from the two major parties, namely, the Kuomintang and the Democratic Progressive Party.