A novel method for preparing Al 2 O 3 /ZrO 2 (Y 2 O 3 ) eutectic was developed by combining combustion synthesis with melt-casting under ultra-high gravity (CSMC-UHG). The application of UHG=800g resulted in a high relative density of 99.8%, and an orientation-growth along the UHG direction. The microstructure was composed of aligned growth regimes containing a triangular dispersion of orderly ZrO 2 rods in Al 2 O 3 matrix with a spacing of 300nm. The eutectic had a high fracture toughness up to 17.9MPa·m 1/2 , which was mainly attributed to the nanostructure and the elastic bridge effects of the aligned ZrO 2 rods.