The blind hole method was used to calibrate the strain release coefficient of QT700, and the most important drilling step in the calibration process was improved. A high-speed drill (rotational speed of 90 000 rpm) and cylindrical milling cutter were used to drill the hole. The results show that the cutting stress of conventional method is reduced and the testing accuracy is improved. On this basis, the values of strain release coefficients A and B are plastic modified, and the maximum relative error is reduced from 97.08% to 3.18%. The strain release coefficient and plasticity correction formula of QT700 material can be directly used to measure the residual stress of QT700 material.