That why the firm is to be is very important for economics on the nature of the firm. However， management' focuses are such as why the firm can be continuance and why the firm must be continuance. For the former， there are two viewpoints such as the view of value activities and the view of core competence. For the later， there are three viewpoints: the firm is an organic system of value creation； the firm is the basic unit of economy development； the firm is an important organization of society function.