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In the present paper an experimental procedure and a finite element model were used to explore the possibilities of determining the creep-damage parameters of duralumin alloy 2A12 incorporated with modified Kachanov–Rabotnov (K–R) creep-damage constitutive equations. To study the phenomenon of creep damage of 2A12 a set of uniaxial tensile creep tests were carried out at 210 °C at different loads—1800, 2000 and 2200 N. From the experiment results and by using the optimum software ISIGHT, creep-damage parameters of duralumin alloy 2A12 based on the modified K–R creep-damage constitutive equations can be obtained by fitting the creep curves. Then, a finite element model was established by implementing a user subroutine in order to predict the creep damage. The optimum results were in agreement with the experimental results as well as the finite element method (FEM) results. The FEM results also showed that the creep damage at about the central part developed faster. An important conclusion obtained from the comparison was that the modified K–R creep-damage constitutive equations could be used to predict the creep damage and the residual strength as well as the optimum method could be used to treat the experimental results and calculate the creep-damage parameters of some metal materials.