[en] To validate the reliability of Judd-Ofelt results and the influence of involving absorption transition number, the Judd-Ofelt calculations, in which various transitions were adopted, were carried out for Tm³⁺ doped LiYF₄ single crystal. It was found that introducing more transitions into the calculation procedure might get more reliable results. In order to clarify the feasibility of temperature self-reading in Tm³⁺/Yb³⁺ doped LiYF₄ single crystal during laser operation, the temperature sensing properties of the single crystal were studied. It was found that the fluorescence intensity ratio of ³F₂+³F₃→³H₆ to ³H₄→³H₆ can be used for achieving better temperature detection, and the temperature sensitivity was found much better than that in other materials.