The spatial planning network in government is formed through the interaction of spatial planning authorities at various levels and functions. Clarifying the relatively mature interaction between spatial planning authorities is conducive to providing empirical reference for the construction of spatial planning that corresponds to the context of China's landownership. The comparative research method and inductive deduction method are used in this paper to examine the regulatory systems of spatial planning in America and Britain from the perspective of power coordination. Based on specific legal provisions, the paper begins with a vertical perspective of power distribution between central and local governments, between neighboring local governments, and a horizontal perspective of power distribution between local governments at the same level, between relevant government departments. The paper examines the administrative context as well as the particular way in which legal provisions coordinate authorities across all levels of government and various departments. The basic discrepancies in the distribution structure of spatial planning power between the two nations were compared and revealed. The study discovered that the operation of spatial planning power in America and Britain is carried out through corresponding planning regulations, and the differences in power distribution are rooted in distinct national political backgrounds and administrative systems. According to the research findings, the construction and optimization of spatial planning regulations in China should be based on national conditions. It is necessary to clarify the basis for legislation and adhere to the principle of procedural fairness, also to coordinate the construction of planning power system and perfect the layout of regulating authorities by law. Ultimately, the effective implementation and operation of spatial planning should be guaranteed through valid law and competent governance.