After the announcement of the policy of “free port” in modern times, the Portuguese Macau authorities chose the management mode of the charging system according to the special political and social ecology. Although it suppressed the development of free trade to a certain extent, it played a role that cannot be ignored for the transformation of Macau's fiscal system and the maintenance of the stability of social order, as well as provided institutional guarantee for the realization of “small government” to manage “large society”. It was the most suitable governance mode for the sustainable development of the modern Macau.