Siemens' 1200 linear interpolation algorithm is an algorithm used to control the linear interpolation process in CNC system. This algorithm is used to calculate the path and speed control between interpolation points when NC machine tools perform linear motion. Specifically, when the CNC machine tool needs to do linear motion, the control system needs to calculate the coordinates and time of each interpolation point through interpolation algorithm according to the given starting point and ending point coordinates, as well as the required parameters such as speed and acceleration, so as to realize smooth linear motion. In 1200 linear interpolation algorithm, considering the dynamic characteristics of machine tool and acceleration limitation, the path between interpolation points will be optimized to ensure the smoothness and accuracy of motion.