China's HIV/AIDS policy progress displays a long-term stagnancy followed by a sudden revolution. This article utilizes multiple theoretical tools to interpret this policy progress. It identifies four phases of China's HIV/AIDS policy process: (1) institutional endurance interpreted by path dependence from historical institutionalism; (2) deinstitutionalization explained by Oliver's antecedents of deinstitutionalization; (3) the radical shift interpreted by Kingdon's agenda-setting theory; and (4) reinstitutionalization and diffusion of institutional theory. This study demonstrates the utility of “creative borrowing”—employing multiple theoretical tools to harness the strengths of each. Doing so reveals that a country's past experience with ...