Sintered aluminous abrasive grains having a density of at least 95% of theoretical density and having an alpha alumina crystal size of smaller than one micron. Which are obtained by drying and crushing a lithium containing alumina dispersion and sintering the crushed objects at 1100.degree.-1500.degree. C., said abrasive grains have the strength and hardness equal to or higher than conventional abrasive grains, superior properties in grinding resistance and wear resistance and superior self-sharpening property in course of grinding.