Abstract: The development of instrumented impact test machine makes impact test process visible,quantitative and digital.By analysis of the curve and data for thousands of impact test,it is found that besides total impact work massive data,such as yield force,maximum force,stable crack growth,initial and terminal force of unstable crack growth,can be obtained,so more accurate and digital comparative analysis and evaluation for mechanical properties of metal material are possible,which will be benefit to the research of metal material manufacture and optimization of rolling process.