The monotonous government regulation resulted from the industrial society is difficult to support the sustainable development of the sharing economy of the postindustrial society. Based on the theory of legal autonomy, governance theory and regulatory response theory, the theory of postregulatory state focuses on the pluralism of regulatory bodies, regulatory norms, and regulatory mechanisms, as well as on the ability of enterprises to selfregulate and their complementary functions, forming a new regulatory analysis framework. And through the angle of postregulatory state, we can find a new regulatory model that is sought by and compatible with the sustainable development of the sharing economy, because the multiple subsystems in the economic ecosystem are the subjects of selfregulation. On the “soft foundation” of sharing economic operation, the subsystems cooperate with each other or within and with government regulations to form a new regulatory model: cooperative regulatory governing mode. This regulatory model can better realize the guiding value of inclusive and prudent administrative supervision strategies, and can better maintain and promote the sustainable development of the sharing economy.