The incoming alumina powder is prepared into powder materials according to different product requirements and different molding processes. The particle size of the powder is less than 1 μm. If the high-purity alumina ceramic products are manufactured in addition to the alumina purity of 99.99%, ultrafine crushing is required to make the particle size distribution uniform. When extrusion molding or injection molding is used, a binder and a plasticizer need to be introduced into the powder. Generally, a thermoplastic plastic or resin organic binder with a weight ratio of 10-30% should be at a temperature of 150-200 with alumina powder. Mix evenly to facilitate the molding operation.