<p>Due to the lightweight and high-temperature resistance, TiAl alloys have exhibited significant application potential in aviation engines. As a promising alternative to conventional Ni-based superalloys, TiAl alloys could drive large-scale production of both low- and high-temperature components in the aviation industry. However, the challenges in heterogeneous joining with ceramics, superalloys, steels, and C/C composites have hindered their widespread application. Extensive research has identified brazing as the most suitable bonding method. This review integrates recent advances in the structural evolution and interfacial diffusion behaviors of TiAl alloy joints, with an emphasis on their impact on microstructure and mechanical properties. Key interfacial regulation strategies, including filler composition optimization, interlayer design, and process enhancement, are systematically summarized. Future research should focus on clarifying the interfacial mechanisms that govern joint performance. The integration of interface regulation strategies with computer-aided filler design is expected to provide a pathway toward reliable and high-performance heterogeneous brazing.</p> Graphical abstract <p></p>