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In view of the high photonic thermal conductivity of thermal barrier coatings, a Gd-doped YSZ-NiCr₂O₄ composite (GYSZ-NCO) was designed, and its sintering parameters, thermal stability and thermal conductivity were analyzed. The results show that tetragonal GYSZ can be obtained when the sintering temperature is 1600 ℃, and the GYSZ-NCO series materials have high thermal stability at 1500 ℃, and no phase transition occurs after holding for 300 h. After adding NiCr₂O₄, the thermal conductivity of GYSZ did not rebound significantly at high temperature, showing excellent thermal conductivity against photons. The thermal conductivity of the GYSZ-5%NCO material has the lowest thermal conductivity, which is only 2.23 W/(m.K) at 1200 °C.