Abstract: Based on the distributed architecture, this paper designs the architecture of the CNC system. A new system architecture is proposed from the perspective of system hardware architecture and system software architecture ,which is characterized by modular superposition, separation, independent optimization and easy iteration.At the same time, it can also meet the computational requirements of high accuracy, high efficiency and high surface quality.Meet the requirements of intellectualization, networking and informatization of future CNC system.This paper verifies the feasibility of this new system architecture. It constructs a new design idea for the architecture design of high-end CNC system.