The purpose of this article is to examine the relative influence of the legislative branch and executive branch in the process of lawmaking, under different periods of time of the unified and divided government. This research focuses on the fourth term of the Legislative Yuan. The research period of time ranges from 1999 February to 2002 January, divided into two periods: the first begins from February 1999 to May 2000, in which the KMT dominates the executive and the legislative branches.