The tensile deformation and fracture behavior tests under both room and high temperature are conducted on notched specimens of titanium alloy used commonly in aeroengine disc. Then a large deformation constitutive model is established. Based on the constitutive model, load-displacement curves of notched specimens are obtained by large deformation finite element analysis. The tensile broken load is defined as the value at the highest point of load-displacement curve. The predicted tensile broken loads are compared with the tests, and the theoretical predicted values are in good agreement with experimental ones. The results show that the proposed method for predicting tensile broken load is valid.