本文首先从学理层面论证媒介化协商是媒体外交在解决国际争端中的具体应用；接着在实践层面，以美国和俄罗斯媒体就叙利亚化武事件展开的媒介化协商为例，从媒体框架互动、信源和隐喻三个方面讨论了两国媒体如何围绕核心议题展开互动与对话，推动该事件最后以采纳俄方抛出的议案为框架签署协议而告终。本文指出，框架互动分析呈现了美俄媒体展开媒介化协商的概貌，而两国媒体围绕核心隐喻进行的对话、讨论甚至辩论，构成了媒介化协商的支点，并贯穿于媒介化协商的整个过程，引用多元化信源不仅增强了俄方观点的公信力，还在观点的交叉论证中进一步论证俄方言论。

This paper theoretically explores mediated negotiation as the practice of media diplomacy in resolving international disputes. It further discusses a mediated negotiation case, which is how U.S. and Russia made use of their own media to achieve mediated dialogue in the 2013 Syrian chemical weapons incident, by means of media frame interaction, source and metaphor analysis. It finds that the active-passive status of Russian and U.S. media in this incident affects the international public opinion and finally pushes forward the two countries to adopt Russia’s proposal to reach an agreement. This paper also discusses the mediated negotiation model consisted of frame interaction, source and metaphor, with the frame interaction to show the picture of the mediated negotiation, dialogue and discussion on core metaphors as the logic line throughout the whole process of mediated negotiation, and multiple sources to demonstrate one’s credibility and views.