China presents the Community of Shared Future for Mankind (CSFM) as a universal response to fractured global governance. However, it remains unclear how ideas associated with Tianxia are rearticulated in CSFM and whether repetition in international institutions demonstrates norm acceptance. This article uses an interpretive qualitative case study and directed content analysis of a purposively bounded corpus of 13 documents from 2013 to 2023, triangulated with critical scholarship and three expert interviews. It identifies thematic resonances that the contemporary Tianxia literature associates with relationality, harmony, and moral responsibility, selectively rearticulated in a vocabulary of sovereignty, development, and multilateralism. Across the Belt and Road Initiative (BRI), Asian Infrastructure Investment Bank (AIIB), Shanghai Cooperation Organization (SCO), and United Nations (UN), the strongest observable mechanisms are discursive coupling and negotiated textual inscription; material cooperation does not, by itself, establish normative adoption. Fragmented BRI implementation, negotiated AIIB design, heterogeneous SCO interests, and a divided UN Human Rights Council vote indicate selective and contested uptake. The article adds to this by separating norm promotion, institutional inscription, external uptake, and internalization. CSFM is therefore best assessed as a broad normative frame under sustained state-led promotion, rather than as a norm that has entered an established cascade. Keywords—China, Community of Shared Future for Mankind, Constructivism, Norm Diffusion, Tianxia
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