The superplastic deformation behavior of rolled TiB_w/TA15 titanium matrix composites at different strain rates in the temperature range of 920–980 ℃ was studied from the phase transition point below 100 ℃. The results show that the rolled TiB_w/TA15 titanium matrix composites exhibit good superplasticity at high temperature, and the best superplasticity at 960 ℃ and strain rate of 0.001 s^–1, the elongation of the composites is as high as 569 %. At the same time, the hyperbolic sinusoidal Arrhenius constitutive equation of the composite was established, and the activation energy of the composite was obtained and the superplastic deformation mechanism was revealed. The microstructure analysis shows that under the optimal superplastic deformation condition, α phase has a significant dynamic recrystallization spheroidization, and there is no obvious cavity in the interior.