为了在激光热处理过程中能更好地控制工件温度，并为激光热处理的数学模拟提供更为准确的激光吸收率数据，研究了材料表面粗糙度对激光吸收率的影响原理，等效处理了材料表面轮廓线，建立了数学模型，采用集**量法测得激光的吸收率，得到的激光吸收率与理论公式计算所得的光吸收率相吻合。结果表明，所建立的模型可以准确地描述材料表面粗糙度对激光吸收率的影响，更有利于激光热处理各项参量的控制。

The influence of surface roughness on laser absorptivity was studied to better control the temperature of workpiece during laser heat treatment process and supply more precise calculate model of laser absorptivity for mathematical simulation. The surface outline of material was equivalent treated,then mathematical model was set up. The laser aborptivity was measured bylumped parameter method,which was agreed with the value of laser absorptivity calculated by theoretical formula. The results indicated that the mathematical model could exactly describe the influence of surface roughness on laser absorptivity.