Abstract: Scientific research integrity is the cornerstone of scientific and technological innovation. Research on the evolution of scientific research integrity and policy system is helpful to understand the core meaning and internal logic of the policy, and has positive significance for improving the level of scientific research integrity and ethical governance.The evolution analysisof policy system includes the analysis of the past development process, existing structure and future evolution trend of the policy system. Existing research focuses on the development process of scientific research integrity and the distribution of policy themes, but there is little research on the policy system architecture and the future trend of policies. In terms of research methods, the existing methods need to be improved in terms of fine-grainedness, semantics, and directness of analysis.Aiming at the gaps in current policy content analysis and shortcomings in methods, this paper introduces the concept of policy minimum particle deconstruction,proposes the minimum particle deconstruction method and three basic structures, and theoretically explains the policy deconstruction with constructivism,and designs the analysis framework of policy system evolution based on the policy minimum particle deconstruction.Taking 55 national research integrity policies since the 1980s as the research object, this paper analyzes the development history, policy priorities, policy frontiers, policy blank areas, policy framework evolution and evolution trend of China's research integrity policies.The research shows that the scientific research integrity policy system evolves in sequence according to the "embryonic stage - basic layout stage - linkage promotion stage - system expansion stage", forming a policy system including five major themes of "division of responsibilities, information records, disciplinary measures, institutional provisions, and ethical governance", and 195 minimum policy particles. The evolution of the scientific research integrity policy system follows the three basic logics of "the policy system is evolving and improving", "the probability of a new policy measure appearing will reappear", and "the repeated phenomenon of the number of policy particles conforms to the Matthew effect of" the stronger ". Further standardizing investigation and handling, moving forward the creditworthiness threshold, strengthening the use of credit information, further eliminating "paper-only", clarifying disciplinary measures, deepening ethical governance, consolidating entity responsibility, accelerating the establishment of market-oriented credit institutions, cultivating credit professionals, managing credit information security, establishing and completing supporting mechanisms for credit repair and other 11 aspects will be the trend direction for future policy evolution.The inspiration from the study is to continue to focus on the policy, and actively focus on the policy frontier and policy gaps. In particular, on the one hand, we should accelerate the promotion of ethical governance in new tracks and new fields such as artificial intelligence and biomedicine, accelerate the formulation of relevant ethical norms, carry out responsible innovation, and grasp the initiative of industrial discourse; On the other hand, we should pay attention to the "last mile" of the implementation of the scientific research integrity policy, and reflect the policy value in the solid implementation of the policy.In the future, the framework model and specific methods can be further optimized, moreover,further empirical research can be carried out in the field of large samples and in-depth research can be carried out in exploring computer intervention.