The system can reduce the error caused by unqualified rework and secondary clamping which affect the schedule and construction period. Use in-machine measurement, no need to get off the machine, can be remedied. For the time consuming problems of large workpiece detection, disassembly, handling, the use of on-machine measurement, do not need to transfer to the coordinate measuring instrument, you can com- plete the inspection. For the mass production of parts, the product size is unstable, the defective rate is high, after the use of the in-machine measurement, it can automatically carry out deviation correction, reduce the defective rate