This study explores the enactment of critical thinking policies in Chinese senior high schools through the lens of Ball et al.’s policy enactment theory and within the broader context of Chinese education reform aimed at enhancing students’ thinking abilities. Employing a case study methodology with diverse data types, the research assessed current school-level practices and the effectiveness of Ball et al.’s framework in capturing interactions among objective contexts, policy actors, and cultural artefacts. Findings indicate that the framework captures these complexities when the policy is actively enacted. In one school, a systematic enactment mechanism facilitated diverse policy roles and external connections, thereby promoting schoolwide critical thinking development; however, another school exhibited fragmented practices due to the lack of key policy roles, despite students’ interest in deeper engagement. Challenges were also identified, including deficiencies in the mid-level education bureau and conflicts between a collective-oriented educational paradigm and the promotion of independent thinking. The study unravelled the nuances of the enactment of critical thinking policies in Chinese senior high schools. Future research could test the framework’s applicability for guiding the construction of policy mechanisms across different settings.