The detection technology of the on-machine measurement system is based on the machine tool as the hardware carrier,the machine tool probe as the touch testing tool,combined with the three-dimensional modeling,measurement path planning,virtual simulation and other software applications,to generate the measurement program that can be recognized by the machine tool numerical control system,to realize the detection of the geometric characteristics in the machine in the process of parts processing,and to generate a report after error compensation in the numerical control system,which can guide the subsequent process optimization and improvement according to the test results.Through the investigation of the current situation and demand of domestic on-machine measurement and detection technology,we have an in-depth under-standing of the overall process of on-machine measurement system detection technology,analyze and solve various difficulties encountered in the process of on-machine measurement,measure and evaluate the sys-tematic errors introduced in the machine tool detection process and compensate for them,and evaluate and give the conclusion of the applicability of on-machine measurement technology,so as to expand the direc-tion for the application of on-machine measurement technology in the future.