The dry pressing technology of alumina ceramics is limited to parts with simple shapes, inner wall thickness exceeding 1mm, and width to radius ratio not greater than 4:1. The forming method is uniaxial or bidirectional. There are two types of presses, hydraulic and mechanical, which can be semi-automatic or fully automatic. The maximum pressure of the press is 200Mpa. The output can reach 15 to 50 pieces per minute. Because the stroke pressure of the hydraulic press is uniform, the height of the pressed parts is different when the powder filling is different. The pressure applied by the mechanical press varies with the amount of powder filling, which can easily cause differences in the proportion reduction after sintering and affect the quality of the product. Therefore, the uniform distribution of powder particles in the dry pressing process is very important for mold filling. Whether the filling amount is standard or not has a great influence on the control of the proportion accuracy of the manufactured alumina ceramic parts. Powder particles greater than 60μm and between 60 and 200 mesh can achieve the maximum free flow effect and the best pressure forming effect.