We studied a wet-jet milling process as a novel method to prepare stable ceramic slurries because properties of slurry have an influence on the manufacturing cost, the material characteristics and the reliability of products. The wet-jet milled slurries showed low viscosity and were stable for a long time. The slurry could produce green high-density bodies regardless of the slurry solid content as well as sintered compacts with low shrinkage. Our process can contribute strongly to the reliability improvement in the ceramic material and the components.