（Gd，Lu）₂O₃∶Eu scintillation ceramics have promising applications in the high-energy X-ray imaging. Eu_0.1Gd_0.6Lu_1.3O₃ nano-powders with pure phase were prepared from the precursor calcined at 1 050 ℃ for 4 h by the co-precipitation method. Using the synthesized nano-powders as initial material， Eu_0.1Gd_0.6Lu_1.3O₃ ceramics were fabricated by vacuum pre-sintering at different temperatures for 2 h and hot isostatic pressing （HIP） at 1 750 ℃ for 3 h in argon. The influence of pre-sintering temperature on the microstructure， optical and luminescence properties was investigated. The Eu_0.1Gd_0.6Lu_1.3O₃ ceramics pre-sintered at 1 625 ℃ for 2 h combined with HIP post-treatment show the highest in-line transmittance of 75.2% at 611 nm. The photoluminescence （PL） and X-ray excited luminescence （XEL） spectra of the Eu_0.1Gd_0.6Lu_1.3O₃ transparent ceramics demonstrate a strong red emission peak at 611 nm due to the ⁵D₀→⁷F₂ transition of Eu³⁺. The PL， PLE and XEL intensities of the HIP post-treated Eu_0.1Gd_0.6Lu_1.3O₃ ceramics show a trend of first ascending and then descending with the increase of pre-sintering temperature. The thermally stimulated luminescence （TSL） curve of the HIP post-treated Eu_0.1Gd_0.6Lu_1.3O₃ ceramics presents one high peak at 178 K and two peaks with lower intensities at 253 K and 320 K. The peak at 320 K may be related to oxygen vacancies， and the luminescence peak at 178 K is related to defects caused by the valence state changes of Eu³⁺ ions.

（Gd，Lu）₂O₃∶Eu;Transparent ceramics;Microstructure;Optical properties;Hot isostatic pressing