Abstract: National reading is a crucial component of building a culturally strong country, and the core role of reading promotion policies has become increasingly prominent. Exploring the operational mechanism of China's reading promotion policies can provide valuable insights for optimizing the formulation and implementation processes of future policies. Based on grounded theory, this paper systematically analyzes 74 national and local reading promotion policy texts, and constructs a theoretical framework for the operational mechanism of China's reading promotion policies, which includes 4 main categories and 12 initial categories. The finding reveals that the policy-driven effectiveness is first released through systematic policy design, laying the foundation for reading promotion actions. Then, an implementation pathway integrating scenario-based practical actions and service guarantee mechanisms is formed to enable policy transformation into practice. Meanwhile, the outcome feedback mechanism based on supervision and evaluation scientifically tests the effectiveness of policy formulation and implementation. Policy driving forces, implementation transformation, and outcome feedback are connected with each other, coordinate dynamically, and jointly promote national reading to transform from an abstract national policy into a public cultural practice that covers all regions and all groups of people.