Creep tests were carried out on Ti-600 alloy at the temperature of 550, 600 and 650 oC, and with the stresses of 250, 300 and 350 MPa. Steady state creep rate, stress exponent n, activation energy Q at different temperatures and various stresses were calculated for the alloy. Threshold stress σ0 was introduced to get the true stress exponent p. Creep deformation mechanism was also investigated. The results indicate that the steady state creep rate will increase with the rise of temperature and stress, and the creep time will be shortened at the same time. The nominal creep activation energy for the alloy is 473.5 kJ/mol. At 600 and 650 oC, the threshold stress is 103.1 and 42.1 MPa, respectively; n is 6.5 and 4.9, respectively; p is 4.23 and 4.22, respectively. Constitutive equations of steady state creep rate for the alloy were established both at 600 and at 650 oC. The main creep deformation mechanism for the alloy is dislocation climbing