Today‘s machining is more inclined to high-precision, multi-variety, small batch, low cost, short cycle and complex processing. Composite machining is one of the important technical development directions of numerical control machine tools. Composite function makes numerical control machine tools significantly improve the production speed of workpiece cost, can greatly eliminate the transportation, clamping and waiting time in the process of process processing, so that the processing cycle is greatly shortened. The workpiece has only one clamping and positioning on the machine tool, which not only reduces the processing auxiliary time, but also improves the processing accuracy of the workpiece. Obviously, complex combined machining machine tools have higher requirements for automated products. The realization of composite function relies on real-time detection and intelligent judgment, data operation, tool management and system control for workpieces and tools. Automation products and technologies such as high-sensitivity probes, high-speed processing chips, smaller and faster-responding sensors and actuators will be more widely used in machine tools.