Accuracy of pre-stack migration velocity analysis is impacted by S/N and resolution of seismic data,geometry(mainly about observation aperture)and imaging method,which is difficult for quantitative evaluation.

According to strict requirements of aperture shape of high-speed drawing die and producing/repairing process,the paper expounds how the aperture measuring system for drawing die is designed,from two aspects of hardware and software,by means of computer technology,micro displacement measuring way,and data fitting algorithm.