Abstract:We tested the PCT curves of Zr-0 alloy under different temperature and calculated thermodynamic parameters according thermodynamic equilibrium of deuteride equation. The results show that the Equilibrium pressure, The maximum amount of deuterium absorbtion and desorption increases with Elevated temperature. The equilibrium pressure and the maximum amount of deuterium absorbtion are 0.12MPa, 5.2%（mass％）.The maximum amount of deuterium desorption is 2.2%（mass％）when the temoerature is 900℃.The Standard molar entropy change of Zr-0 alloy separate out ZrD is -32.74J/mol, the standard molar enthalpy change is -47.68kJ/mol, the ZrD separated out equilibrium temperature is 1183℃(1456K). The Standard molar entropy change of Zr-0 alloy separate out ZrD1.66 is -290.86J/mol, the standard molar enthalpy change is -326.55kJ/mol, the ZrD separated out equilibrium temperature is 850℃(1123K). The calculated results are consistent with the experimental results..