This thesis is an attempt to understand the accomplishment and restrictions of present liberalism from the viewpoint of communitarianism. Liberalism (or constitutional democracy) is the representation of the long-term history of mutual influences among political, cultural and economic structures in western civil society. It is not an abstract noun; on the contrary, it represents the result of dialogues among numerous individuals and communities under specific contexts of time and space. Civil society emerges at the same time when individuals depart from the traditional community. Accordingly, there is a qualitative change in the citizenship from active republicanism to passive liberalism. In other words, citizens are no longer interested in political participation, and turn to self-realization in personal matters. On the one hand, it results in a diverse and prosperous society; on the other hand, the positive citizen participation gradually collapses during this process. The phenomenon mentioned above requires us to find an institution or procedure to balance the common goods and private interests. Meanwhile, certain virtues of the citizenry are requisite to maintain the system. If not, no matter how perfect the institution is, it will be threatened by failure. Therefore, in order to promote the virtues of the citizens and to respond to the vigorous individuality and a diverse and prosperous society, constitutional democracy should be taken as the core of our civil education.