The TiAl alloy was brazed to Si3N4f/Si3N4 composite using AgCuTi filler metal. The typical interfacial microstructure of the joint is TiAl/AlCuTi reaction layer/Ag based solid solution/TiN reaction layer/Si3N4f/Si3N4. During the brazing process, liquid solder wets the surfaces of Si3N4f/Si3N4 composite well, and the active element Ti reacts with Si3N4 matrix and fibers to form continuous TiN compounds layer. The amount of brittle AlCuTi intermetallics increases when the brazing temperature is much higher or the brazing time is much longer. Some microcracks form in AlCuTi intermetallics due to the residual stress in the joint, which seriously degrade the joining properties. A maximum of 9.4 MPa of the shear strength can be obtained when the brazing temperature T=860 °C and holding time t=5 min, which exceeds 60% of the strength of composite materials. Fracture analysis shows that fracture occurs in the side of Si3N4f/Si3N4 composite.