析了利用PMAC--PCI的PID调节功能提高数控系统的精度、降低系统跟踪误差的重要性。建立了基于PMAC—PCI的控制算法，并通过PID参数的调整加以验证。-Analysis of the use of PMAC- PCI regulatory function of the PID to improve the accuracy of numerical control system to reduce the importance of the system tracking error. Established a PMAC-PCI-based control algorithms, and through the adjustment of PID parameters to be verified.