Abstract: Based on the extensive first-hand archival drawings, this paper examines the reproduction and reinterpretation of Baroque and Beaux-Arts features in the urban planning of Tianjin’s French Concession. It traces the transmission of Baroque urban ideas from Rome, through their transformation by the French Beaux-Arts system, to their practice in modern Tianjin, and categorizes this evolution into three phases of reinterpretation: power metaphor, rational ordering, and localized adaptation. Through case analyses, this paper explores the transcultural diffusion and localization of European urban planning theories in the Far East from the 19th to early 20th centuries, revealing how Baroque and Beaux-Arts urban genes were reproduced in Tianjin under the interaction between colonial power and local contexts. This paper provides an example for researching the global spread of European urban concepts, thereby enhancing transcultural understandings in architectural history.