Different from the traditional point of view that government is a well-institutionalized decision-organization, this study regards the government as an institution with organized anarchy, full of problematic preferences, unclear technology and fluid participation, which is due to the congressmen's growing self-awareness, increasing power in law-making, and the expansive influence of various societal interest groups on government's policy-decision since the 90's. And because of the organized anarchy, government's policy-making does not always proceed through the rational process of ”problem defining-alternative designing-legislating” but sometimes reach the agreement immediately after some critical political issues or precarious social events, which is validated by this research through the case study of two legislative decision-makings.