激光在工业应用中，相变硬化是一个重要的方面其工艺选择直接影响着相变硬化层的深度和宽度本论文从热传导基本方程出发，得出了光功率密度为高斯分布的激光功率、离焦量、扫描速度等与相变硬化层深度、宽度之间的关系编制了工艺参数选择的计算机软件经实验验证，理论计算与实验结果的相对误差为：硬化层宽度为５７％，硬化层深度为１８７％ Laser In industrial applications, phase transformation hardening is an important aspect of the choice of process has a direct impact on the phase transition hardening layer depth and width  In this paper, starting from the basic heat conduction equation, the optical power density is obtained Gaussian distribution of laser power , The amount of defocus, scanning speed and other phase transformation hardening layer depth and width  prepared a process parameter selection of computer software  experimental verification, the theoretical calculation and experimental results of the relative error: the hardened layer width of 5  7%, the depth of the hardened layer is 18.7%