Planning is a government act. The main function of the planning work is to develop and implement the government's public policy. Urban and rural planning is the discipline of land and space resource allocation. It specifically faces urban construction management behavior, especially the construction of human settlements in the city. A close examination reveals that many public policies have triggered spatial changes in urban and rural areas. Most of these policies may not fall within the scope of urban and rural planning. It also does not directly transform the space on a large scale. But these public policies limit or extend human behavior. This will take the space demand and shape the urban and rural form. In the end, it caused a great change in the urban and rural spatial form. The end link of most public policies is the restriction or incentive for human behavior. Human behavior is limited by space and also shapes space. Everyone’s behavioral activities take place in space, and everyone is the microscopic force that shapes the space. Human individuals have different spatial needs. The sum of individual differential spatial needs constitutes the collective will of human social space needs. The essence of urban and rural planning is the collective will of this space demand. It is a collective choice after weighing the borderless factors of society, culture, economy and environment. It is also an integral part of public policy. However, since urban and rural space is directly related to individual feelings, and because the boundaries between urban and rural planning are not clear, the mechanism of action is unclear, the effect is not direct, and the responsibility is difficult to identify, urban and rural planning plays an active role in urban construction management and human settlements construction. On the other hand, it bears more questions and criticisms from the public and academic circles, and even bears some untrue responsibilities. Urban and rural planning is advancing in the midst of alternating and mixed approvals and criticisms, and is integrated into the national land planning system in the new era. In order to gain a clearer understanding of spatial planning and its policies, we can learn from western urban development and planning theories to re-cognize and distinguish the connotations and differences of academics, jurisprudence and mechanism in the field of planning. And it explores the path to improve the performance of space planning policy implementation. These paths generally include four aspects: 1) Promoting empirical judgment and turn to scenario calculus. That is, to fully understand the development law and policy mechanism of the city, and to rationally construct and evolve algorithms. The "algorithm" is used to reveal the logical relationship closely related to the measurement planning policy, behavioral activities, and space environment. The artificial intelligence method is used to carry out scenario calculation and result prediction, and to deduct better policy arrangements and policy translation. 2) Identifying the implementation of the transmission mechanism. Panning policy is not a linear process of proposing vision, strategy formulation, implementation management, and goal realization. Policy transmission will experience tortuosity, deflection and error correction in the real world. Identifying the transmission mechanism is an important way to balance rationality and irrationality and promote the rationalization of planning. Its purpose is to identify and overcome the "negative effect" of policy. 3) Defining the areas of trial and error and perfecting the error correction mechanism. Spatial planning is difficult to achieve "concentrated rationality." There is a need to provide a game platform for “distributed rationality” and “distributed irrationality”. The premise is to reasonably determine the areas where trial and error can be made. It should apply “concentrated rationality” to many areas that cannot be tried and tested, and clarify “negative list” and “responsibility list”, allowing local space planning and design to explore and compare multiple possibilities to find a better way of working. To build an error correction mechanism, it is necessary to distinguish the three principles of “rigid rules”, “resilient rules” and “elastic rules” to ensure a long-term policy mechanism. 4) Promoting the accumulation of knowledge throughout the planning policy. The boundaries of disciplines should be broken and open source draws on subject knowledge such as psychology and behavioral economics. Gradually, it analyzes the law of spatial development and extends the theory. In terms of application practice, it is necessary to mine and enrich the policy toolbox at the spatial level within the boundaries, consider the development of “artificial intelligence + X”, and promote “artificial intelligence + urban and rural planning”. The most important thing is to grasp the policy mechanism.