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通过研究激光切割焦点位置控制系统的结构模型，确定了控制系统必须满足的性能指标，进而提出PID的控制方案，使系统获得较好的动静态特性．实验证明：运用这种控制方案，系统对斜坡工件和起伏工件的跟踪均能满足要求．
By studying the structural model of the laser cutting focal position control system, the performance index that the control system must meet is determined, and then the PID control scheme is proposed to make the system get better dynamic and static characteristics. Experiments show that: Using this control scheme, the system can meet the requirements of the tracking of sloped and undulating workpieces.