國際關係理論逐漸呈現以理論綜合的方式進行國際關係研究，國際規範研究是其中的重要議題之一，本文嘗試從國際規範的生命週期開始，運用「國際規範社群下的策略行動」(strategic actions in a international norm community)，以理性主義(策略行為)與建構主義(規範行為)理論綜合的策略與研究途徑分析美國「防止擴散安全提議」，探索此國際規範的興起、擴展、內化與侵蝕階段時期中，不同國家的行為動機，藉以呈現說明理論綜合能提供不同面向的相互補充解釋。

The international norm is one of the major topics in international relations research, of which synthesized approach is gradually becoming a trend. This paper attempts to adopt Frank Schimmelfennig's approach- the strategic actions in an international norm community- to synthesize the theories of rationalism and constructivism in the international norm circle. As the case, the Proliferation Security Initiative will be analyzed through different phases of emergence of the life circle-cascade, diffusion, internalization, and erosion- to understand the motives of the participant states. For presenting the synthesized approach, various aspects of understanding can be provided.