Since the political power turnover in 2000, the empty political running and the fierce struggle of political parties of nearly 7 years have made the people disgusted with the power of no accountability and the minority government that is difficult to rule. Besides, we cannot expect the power holder to observe the spiritual meaning of constitutionalism strictly, establish a good constitutionalism model, and lay a foundation for the long-term development of democracy. Therefore, to bring the spirits of democracy, accountability, party politics and rule of law into real play, the eighth amendment of the Constitution is an irreplaceable choice. Only by reforming toward the definite direction of cabinet system, we can maintain the stable development of the Constitution and solve the difficulties in constitutionalism at the same time. This paper will analyze the text and original meaning of the Constitution, discuss the trend of Taiwan's constitutional system, and explain the fitness of cabinet system for our country through comparing the provisions of the Constitution and the Amendment with the characteristics of cabinet system design. Another related question is also discussed in this paper. That is, under the cabinet system orientation of the constitutionalism reform, how to master the opportunity of amending the Constitution to achieve the goal of setting up the cabinet system. It is also discussed how to find out an optimal scheme with the least impact and the slightest adjustment for the constitutionalism reform, so as to lay a solid foundation for developing toward a more complete construction of cabinet system in the future.