Carbon fiber reinforced ZrB₂-SiC composite ceramic and TC4 alloy were connected by using Ag-28Cu filler in the vacuum brazing furnace. Scanning electron microscope，energy dispersion spectrometer and mechanical universal testing machine were used to study the effect of brazing holding time on the microstructure and shear strength of the brazed joint interface. The results show that the carbon fiber reinforced ZrB₂-SiC composite ceramic / Ag-28Cu / TC4 alloy joints are well bonded. The typical joints are composed as following： TC4/TiC+TiCu/Ti₂Cu/TiCu/Cu_（s，s）/Ag_（s，s）/Ti₅Si₃/TiC/ZrB₂-SiC-C. Different holding times have not changed the phase composition of the brazed joints. However， it has an influence on the microstructure of the joints interface， the thickness of the weld and the number of constituent phases. With the increase of brazing holding time， the Ag （s， s） and Cu （s， s） areas in the center of the weld gradually decrease，the thickness of the Ti-Cu reaction layer gradually increased in the TC4 side reaction.The maximum thickness of the weld is 70 μm and the thickness of the central area of the weld is 45 μm when holding for 30 min. The average shear strength at room temperature increased first and then decreased with the increase of holding time and the maximum shear strength is 34 MPa at 810 ℃ with 20 min holding time.