激光在工业应用中，相变硬化是一个重要方面。其工艺选择直接影响着相变硬化层的深度和宽度。从热传导基本方程出发，得出了相变硬化过程中工艺参数（激光功率、光斑直径、离焦量、扫描速度）与硬化层深度、宽度之间的关系。用编制的工艺参数选择的计算机软件计算的结果与实验结果进行了比较，其相对误差为：硬化层宽度平均相对误差为３７％，硬化层深度为１８７％。 Laser In industrial applications, phase change hardening is an important aspect. The choice of process directly affects the depth and width of the phase-change hardened layer. Based on the basic heat conduction equation, the relationship between the process parameters (laser power, spot diameter, defocus amount and scan speed) and the depth and width of hardened layer during phase transformation hardening was obtained. The calculated results of the computer software with the selected process parameters were compared with the experimental results. The relative errors were as follows: the average relative width of the hardened layer was 37%, and the depth of the hardened layer was 187%.