Abstract：Based on the theory of irreversible process thermodynamics in partⅠof this paper，non-linear thermodynamic analysis is engaged in，and non-linear stress-strain-temperature equations are established. Thus，general expression for time-temperature equivalent principle is theoretically obtained. And furthermore in part Ⅱ，the equation of displacement factor in time-temperature equivalent principle is derived. At last， the parameters in the equation are determined，and the main curves for creep compliance and cohesive of Three Gorges granite are obtained by a series of tests. As a result，it is proved that both deformation and strength performances obey the principle.
