通过光线追迹程序对红外光在黑腔中的传播进行模拟，得到红外光聚焦位置不同时靶壳和燃料的体加热率。模拟结果表明：当燃料冰层实现均化时，相比靶壳，燃料吸收了少部分红外光能量。靶壳和燃料的体加热率随着红外光在黑腔上的聚焦位置而改变，聚焦位置偏移量的增加，靶壳的红外光加热率峰值对应的高度角逐渐变大，而燃料的红外光体加热率逐渐变小。因此，通过改变红外光的聚焦位置对靶丸以特定的体积热率加热，从而达到燃料均化所需的温度场。

The infrared heating has been demonstrated as an effective technique for preparing uniform fuel ice in ICF cryotargets. A ray tracing program is used to simulate the infrared light propagation in hohlraum, and the volumetric heating rates of shell and fuel are obtained with different focus positions of infrared light. It is found that the volumetric heating rates of the shell and fuel can be adjusted by the focus positions of infrared light. Therefore, the temperature field of fuel required for fuel layering can be achieved by adjusting the focus positions of infrared light. This work is helpful for the future layering experiments of ICF cryotargets by infrared heating.