In order to verify the consistency between the results of the automatic measurement of CNC machine tools and the results of the CMM,the geometric accuracy of standard test pieces was tested with the help of CNC,the on-line detection data were compared with the coordinate measuring instrument detection data and these data were analyzed.The analysis result shows that the contrast error between the data of on-line automatic measurement technology and those of CMM is small,and online automatic measurement data are in line with national standards.