The BNi2 filler metal was used to join TiAl-based alloy to Ni-based alloy. Interfacial microstructure and formation phases of brazed joints were investigated by means of scanning electron, energy disperses spectroscopy and X-ray diffraction, and shear strength of the joints was determined. The results show that the typical interfacial microstructure of the joints is GH99/γ+Ni3B+CrB+rich Ti-boride/TiNi2Al/TiNiAl+Ti3Al/TiAl. With the increase of brazing temperature or holding time, more B and Si elements diffuse from the molten brazing filler metal into substrates, which decrease the amount of boride in the joint, while the thickness of TiNi2Al and TiNiAl+Ti3Al increases. When the brazing temperature T=1050 ℃ and the holding time t=5 min, the shear strength of the joints reaches a maximum of 205 MPa, and the joint is mainly fractured at TiNiAl intermetallic layer. Further increase the brazing temperature or holding time results in excessive growth of TiNiAl layer, which reduces the joining properties