Uniaxial and triaxial creep tests have been performed on rock salt of Jintan Salt Mine on high temperature and high pressure triaxial rheological device;the creep characteristics of rock salt are investigated and the effect of stress state and temperature of rock salt are analyzed;and then the creep characteristic curve and parameters are obtained.Based on the character of creep curve of rock salt

a creep constitutive model of rock salt is established by using viscoelasto-plastic theory.Through the test results

it is shown that the steady state creep strain rate is a nonlinear function of diviatoric stress and temperature;a steady state creep constitutive model of rock salt is established.The patameters of constitutive equation are obtained by fitting test data;the theoretic results is proved well by comparison with the experimental results.