歐盟與中國在2010年代中期一度互動熱絡。然而近三年來此友好氣氛出現轉變。為了解此變動中的歐中關係，本文採建構主義的研究途徑，探討歐盟規範性身分認同的建立如何標示著歐中體制競爭的困境，以及此困境是否有解套的辦法。研究發現，歐盟的支持者認為歐盟與中國不盡然是完全對立的國際強權，彼此在體制相異的情況下仍有合作空間可探索。就目前雙方最有成效且具潛力的合作項目—氣候議程—來看，歐中不管在國際建制推動或綠能產業鏈整合上，合作極為緊密。過程中彼此經濟體制上的差異再度浮現，但此差異尚不足以影響彼此合作的進程。

In the mid–2010s, the European Union (EU) and China formed active bilateral relations. However, this cordial relationship has changed tone in the past three years. To understand these shifting EU-China relations, this article takes the constructivist approach to discuss how the EU’s normative identity contributes to the predicament of EU-China systemic rivalry and whether this predicament has a solution. The study shows that the supporters of the EU do not perceive the EU and China as two contending international great powers. There is still room for cooperation under systemic rivalry. Taking climate issues as example, the EU and China are in close collaboration both on promoting the international climate regime and on the synergy of green industry value chains. The differences between their economic systems have surfaced throughout the process, but these differences have not been serious enough to stop the course of cooperation.