Since constitutional reform, the congressional caucus system’s operation has been more important in the legislature of legislative process. Nevertheless, the ecology of parliamentary politics has also been more change, and under this influence, so many confusions of congress had often occurred. In order to reach the bottom of this matter, we find the major reasons that the institutionalization of law basic has not perfect yet, and the organizational structure of party-government relationships have also much ills behind back. Especially, concerning choices of internally created party or externally created party is the key points of the congressional caucus system development and orientation now.