Abstract: Ti_43.76Zr_12.50Cu_35.93Ni_6.25Co_1.56 amorphous filler metal was used to realize the vacuum brazing of Ti₂AlNb alloy, and the influence of brazing temperature on the interfacial microstructure, mechanical properties and fracture behavior of Ti₂AlNb alloy joints were investigated. The results show that the brazed joints can be divided into diffusion zone Ⅰ near the Ti₂AlNb alloy side and brazing center zone Ⅱ. The shear strength of the brazed joints gradually increases with the increase of brazing temperature. Under the process conditions of brazing temperature of 965 ℃ and brazing time of 10 min, the shear strength of the joints reaches the maximum value of 89.68 MPa. The fracture surfaces of the joints show complete metallurgical bonding and are characterized by brittle cleavage fracture. Continuing to increase the brazing temperature to 980 ℃, the mechanical properties of the joints are deteriorated to 69.98 MPa due to the obvious coarsening of（Ti, Zr）（Ni, Cu, Al） and AlCuTi₂+Nb_{（s, s）}phases in the brazing seam, which exhibits continuous distributions at the same time. The experiments not only develope a new type of TiZrNiCuCo brazing metal, but also provide some theoretical basis and experimental support for optimizing the brazing process of Ti₂AlNb alloy.