Abstract: At room temperature, high-speed impact destruction test was carried out for radial tyre tread compound by the split Hopkinson pressure bar apparatus at strain rate of 2 000-5 400 s-1, and stress-true strain curves were obtained at high-speed impact. A dynamic constitutive model used at high strain rate with brittle characteristics was built by modifying Mooney-Rivlin constitutive model, and the constitutive model parameters were obtained by nonlinear fitting. The results show that the tread compound presented nonlinear stress-strain relationship, the yield stress increased from 89 MPa to 345 MPa with the increase of strain rate, showing strain rate hardening effect and brittle fracture characteristic. The calculated true stress-true strain values were in good agreement with the experimental ones, this verfied the reliability of dynamic constitutive model.