Abstract: A Chaboche constitutive modeling method for describing metal stable cyclic stress-strain relationship was proposed based on test datum calculated from Ramberg-Osgood model, and was evaluated by TC11 titanium alloy test datum. The result shows the method used to describe metal stable cyclic plastic constitutive model was feasible. The Chaboche model can be used to accurately depict metal stable cyclic stress-strain relationship. It had identical results with common Ramberg-Osgood model in Engineering. The Chaboche model was convenient for finite element stress-strain analysis for metal structures while predicting fatigue life.