(Nd x Y 0.9 − x La 0.1 ) 2 O 3 (x=0.01–0.04) transparent ceramics were fabricated by conventional solid state reaction processing. Spectroscopic properties and crystal structures were investigated. (Nd 0.01 Y 0.89 La 0.1 ) 2 O 3 ceramics display high transparency and dense structure with almost no pores. The highest transmittance reaches 80%. The absorption at LD wavelength 806nm is high with broad full width at half maximum (FWHM) of about 6nm. The strongest emission peak is centered at 1078nm with broad FWHM of about 9nm and the stimulated emission cross section is 4.97×10 − 20 cm 2 . The crystal structure was obtained via Rietveld refinement. It is found that (Nd x Y 0.9 − x La 0.1 ) 2 O 3 crystallize in space group of Ia3¯, Z=16. The lattice parameters and average bond lengths are increased with the increase of La 2 O 3 and Nd 2 O 3 contents.