A three-dimensional laser cutting CNC system architecture with micro-step hardware interpolation as the core is proposed. The software tasks are analyzed and a real-time scheduling model of control functions is constructed. The real-time and multi-task coordinated control of the Windows platform is realized. Developed a micro-step hardware interpolation module based on DDA precision interpolation to meet the speed and accuracy requirements of motion control; built a core drive module to achieve interrupt response and servo control; combined space arc transfer theory and forwardbacktracking algorithm to develop the trajectory speed prediction and smoothing module; proposed the hardware frequency division adjustment method to realize the change of the feed rate. The 3D laser cutting numerical control system can realize high-speed and high-precision motion control

and the open structure of the combination of software and hardware improves the real-time performance of the system and the scalability of functions.