The thermal deformation tests of Cu-0.90Cr-0.18Zr alloy were conducted at the deformation temperature of 500~800 °C and the strain rate of 0.01~1 s-1 on the Gleeble-1500 thermal-mechanical simulator. The flow stress, the constitutive equation and the critical conditions of dynamic recrystallization were studied. The results show that the flow stress decreases with the increasing of deformation temperature or with the decreasing of strain rate, The constitutive equation was established with the activation energy 584.87 kJ/mol. The critical strain of dynamic recrystallization was studied by inflection point of lnθ-ε curve and minimum value of -e curve.