This research focuses on a special type of metaphor that has a special course meaning. From the level of the composite relationship of diplomacy, this type of metaphor includes composite diplomatic actor' which is a kind of political course, and its construction is a political communication action which transfers diplomatic information and connotative meaning. Metaphor has been deepening as the cognitive tool, which leads the formation of one concept in the domain of Constructivism and becomes an unique semiotics perspective in the study of the composite relationship of diplomacy. This study is based on the case of the documentary Super China broadcast on KBS in 2015, using the text analysis method and discourse analysis tools, focusing on the composite relationship of diplomacy in "South Korea - America - China" formed in the text. In this way, the underlying framework and focus of discourse, the connotative meaning, the powers relationship among countries and the position of countries’ status will be explored. Through the construction of metaphor in the text, one state’s government can convey the information of foreign policy about target countries and multilateral relations to domestic people, prompting the consistency and continuity between public cognition and government policies. From the metaphor construction point of view of the diplomatic policy decision-makers, they may make a series of special association relations to construct metaphor, for attaining social consensus national identity and national interests community. From the metaphor deconstruction point of view of text analysis, the metaphor deconstruction through course maker’s socio-cultural context may understand their nation interests more accurately and forecast their multilateral diplomatic policy more clearly.