利用有限元软件对低温绝对辐射计热沉在测量过程中的动态响应进行了研究，分析了影响热沉平衡温度的关键因素和不同结构下热沉对应的温度变化，并对比了304号不锈钢、6061铝合金和无氧高导铜材料作为热链接时热沉的响应状态。结果表明，低比热容和低热导率的热链接材料是未来低温辐射计发展的首选。另外，对辐射计结构进行合理的调节可以实现对热沉平衡温度的有效控制。

The dynamic response of heat sink in the measurement process by an absolute cryogenic radiometer is studied with the finite element method, the key factors affecting the equilibrium temperature of heat sink and the temperature variations under different heat sink structures are analyzed, and the thermal responses when 304 stainless steel, 6061 aluminum alloy, and oxygen-free high-conductivity copper are respectively used as thermal links are compared. The results indicate that, a heat link with low heat capacity and thermal conductivity is the first choice in the future of cryogenic radiometers. In addition, the equilibrium temperature of heat sink can be effectively controlled via suitable adjustment of the heat sink structure.