Regulatory policy is one of the government core function by which it intervenes in citizen's behaviors through direct command and control regulation or indirect economic incentives to achieve the policy goals. However, owing to the development of a plural society, a regulatory policy usually not only involves in several agencies' goals, but also involves in cross-agency implementation. This article addresses to explain the crossagency regulatory policy coordination by using a game theoretic approach. First, the author defined the space structure of regulatory implementation from the characteristics of the institutions of regulatory policy. Second, the author used the concept of utility loss to propose the utility function of an agency which implements a cross-agency regulatory policy. Third, a spatial model of game theory was used to interpret the logic of policy coordination in cross-agency regulatory administration and deduced 8 propositions. Finally, this article provided several managerial implications for public managers and suggested some research designs and methods for future study.