Abstract: An oxygen-free high-conductivity copper(OFHC) cylinder was driven by a single-stage gun to impact OFHC plates at the velocity of 205 m/s. The longitudinal stress-time traces in the plates were recorded by the manganin stress gauge and the recovered samples were observed. And the longitudinal stress-time traces in the plates were computed by using the Johnson-Cook(J-C), Zerilli-Armstrong(Z-A) and Steinberg-Cochran-Guinan(S-C-G) constitutive models. Comparison between the experimental and computational results indicates that the peak stresses in the plates computed by the three constitutive models are consistent with the experiments, while the deformations of the cylinder computed by the Z-A and S-C-G models, are more agreeable to the experiments than the J-C model. but, when the impact velocity is 500 m/s, the computed results by the three constitutive models appear markedly different from one another.