Abstract： The strain rate ranges were determined and the uniaxial tensile tests of DP 980 steel sheet under three strain rates were performed. With the nonlinear fitting of the experiment data, the strain rate dependent JohnsonCook constitutive model was established. Meanwhile, an finite element model of roll forming process with the established constitutive model was constructed, and the corresponding experiment was conducted. The resrults indicate that the established constitutive model is reliable, and can be used in further study of roll forming process optimization.