For tire tread rubbers A1 and A2 which were the same kind of rubber but with different cross-linking densities,dynamic tensile experiment was conducted to obtain the curves of storage modulus and loss modulus versus loading frequency.In order to quantitatively analyze the energy loss of rubber under dynamic load with different frequencies and temperatures,a viscoelastic constitutive equation based on generalized Maxwell model was developed.An algorithm of non-linear regression was proposed to fit the curves...