为了研究工作波段在近红外的激光安全问题，建立了连续激光辐照生物组织的热学模型，通过分离变量法求解热传导方程，得出了生物组织在激光辐照阶段和扩散阶段皮肤组织瞬态温度分布的精确解析解，并以氧碘激光辐照皮肤组织为例，计算了皮肤组织在激光辐照下的温度场分布。结果表明，皮肤组织温升随激光辐照时间和功率密度的增加而增加，辐照结束后，皮肤表面温度缓慢下降，深处温度先缓慢上升，再缓慢下降。分析结论与相关实验结果取得一致，证实了所建模型的合理性。该结论对于其它连续激光对物质的热损伤研究是有帮助的。

In order to study near-infrared laser safety problem,the thermal model of biological tissue induced by continuous lasers was set up and the precise expression of transient temperature distribution induced by laser both in irradiation and diffusion process was obtained through discrete variable method. Taking skin tissue irradiated by chemical oxygen-iodine laser as an example,the skin temperature distribution was calculated and analyzed. The calculation showed that temperature increased with the power density and irradiation time,temperature of biological tissue subjected to the surface decreased slowly when the irradiation ended,but the temperature in the deep biological tissue increased at first and then decreased slowly. The analyzing result is in accordance with the relative experimental result,which proves the laser irradiation model correct. The result is helpful to the research of thermal damage induced by continuous laser in material.