以20Cr13 不锈钢板材为实验材料，采用正交实验法进行了Nd∶YAG 脉冲激光打孔实验，分析了工艺参数(脉冲能量、脉冲个数、脉冲宽度、重复频率及离焦量)对微孔成形质量(孔径和锥度)的影响程度，推荐了20Cr13 板材脉冲激光打孔的优化工艺参数组合(通过正交实验法优化得到)和优化实验条件(通过实际实验样品的测量比较得到的成形质量最好的工艺参数组合)。研究结果表明：对于20Cr13 板材Nd∶YAG 脉冲激光打孔，脉冲能量、脉冲宽度和离焦量是影响打孔成形质量的主要因素，脉冲个数和重复频率是影响打孔成形质量的次要因素。

The orthogonal experimental method is utilized to carry out the experimental investigation for the pulsed Nd∶YAG laser drilling of the stainless steel 20Cr13 sheets. The influence levels of the process parameters for laser drilling (pulse energy, pulse number, pulse width, pulse recurrence frequency, and defocusing amount) on the microhole formation quality (microhole diameter and taper angle) are analyzed. The optimized process parameters obtained using orthogonal experimental method and the optimized experimental conditions (the optimized process parameters through the actual experimental measurements and comparison, using which the highest microhole formation quality is achieved) are recommended for the pulsed Nd∶YAG laser drilling of 20Cr13 sheets. Regarding the pulsed Nd∶YAG laser drilling of the stainless steel 20Cr13 sheets, it is shown that the pulse energy, the pulse width, and the defocusing amount are the key factors which influence the microhole formation quality, however, the alteration of the pulse number and the pulse recurrence frequency contribute less to the microhole formation quality.