Abstract: In order to obtain the dynamic mechanical properties and constitutive relationship of 30SiMnCrMoVE, a shell material of ram extended range projectile engine, the quasi-static and dynamic compression test of 30SiMnCrMoVE steel and the strain rate of 498-4752 s^-1were carried out by using the tensile testing machine and Hopkinson compression bar. The results show that 30SiMnCrMoVE steel has good elastoplasticity at low strain rate. The average rheological stress of the material increases from 1869 MPa at 498 s^-1strain rate to 1950 MPa at 4752 s^-1strain rate. With the increase of strain rate, the rheological stress of the material first increases and then remained constant, while the impact absorption energy first increases and then decreases, and finally tends to be stable. When the strain rate exceeds 3600 s^-1, the material breaks, and the relationship between the strain rate sensitivity factor and strain rate under different strain rates is obtained. The Cowper-Symonds（C-S） constitutive model is used to fit the test results. The results show that the error between the constitutive model and the test results is less than 3%. Therefore, the C-S constitutive model can truly reflect the dynamic response behavior of the material.