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Aiming at the personalized need of current industrial automation users, a middleware system is designed to connect CNC system and nesting software. Firstly, a man-machine interface suitable for ordinary engineers to understand and use is designed, and based on the PVI communication mode of process control system, the data of CNC system can be displayed and tracked in real time; The G code generated by the standard nesting software is transmitted to the CNC system through the FTP protocol, and the process communication mode of the message mechanism is adopted to send back the operation parameters of the CNC system when it automatically analyzes and executes the G code in real time, so as to ensure the consistency between the execution path of the CNC system and the programming path of the nesting software. Finally, the middleware was designed and implemented with a company’s nesting software and the CNC system of B&R laser cutting machine. After industrial field tests, the middleware can connect to all the current hardware systems of B&R company, with good stability and can meet the personalized development of users, which is worth promoting.