在能量传递型激光制冷中，对于非均匀线宽比较窄的情况，引起最大制冷效率的激发光频率不随温度的变化而变化；最大制冷效率与温度呈三次暴的关系。对于非均匀线宽比较宽的情况。随着温度的降低，最佳激发光频率与非均匀线形的中心频率差越来越大，并在较低的温度下迅速拉大它们间的距离。由能量传递机制所引起的荧光制冷最大效率也随着温度的降低而越来越低，并在最后趋于零。它们随温度的降低而降低的规律与实验中得到的结论相符合。 In energy transfer laser refrigeration, the frequency of the excitation light that causes the maximum cooling efficiency does not change with the temperature for the case of narrow non-uniform linewidth. The maximum cooling efficiency is related to the temperature in the third. For a wide range of non-uniform linewidth situation. As the temperature decreases, the difference between the optimal excitation frequency and the center frequency of the non-uniform linearity increases and the distance between them rapidly increases at a lower temperature. The maximum efficiency of fluorescence cooling caused by the energy transfer mechanism is also getting lower and lower as the temperature decreases, and finally approaches zero. Their regularity of decreasing with decreasing temperature accords with the conclusion in experiment.