Abstract: In the research of hypervelocity impact, how to identify the metallic material’s parameters under the extreme distortions and high strain rate is a key problem. Steinberg strength model and Gruneisen equation of state were selected to describe the characteristics of Al6061 under the condition of hypervelocity. The SPH algorithm was applied to simulate the hypervelocity impact. The error between the results of experiment and simulation was defined as the optimization objective and 4 parameters in Steinberg strength model were defined as optimization variables. Four parameters were identified automatically by successive response surface method(SRSM). The optimized parameters have a better simulation results than the initial parameters when comparing with the experiments results.