In order to explore the influence of Yb³⁺ and Er³⁺ doping at A position in Sm₂Zr₂O₇ on its thermal conductivity, （Sm_1–x–yYb_xEr_y）₂Zr₂O₇ (x=0.05, 0.1; y=0, 0.1) ceramic materials were prepared by solid-state synthesis, and their phase structure and thermal physical properties were tested. It is found that the modified（Sm_1–x–yYb_xEr_y）₂Zr₂O₇ ceramic material has a cubic pyrochlore structure. Due to the change of mass difference and radius difference, phonon scattering increases, average free path decreases, and thermal conductivity decreases. At 600 ℃, the thermal conductivity of (Sm_0.85Yb_0.05Er_0.1）₂Zr₂O₇ is 1.3 W/(m·K). The co-doping of Yb³⁺ and Er³⁺ can effectively reduce the thermal diffusivity and thermal conductivity (RT–1000 ℃ ) of ceramic materials, which can be used as candidate materials for thermal barrier coatings.