Al₂O₃ ceramics have received widespread attention due to their high strength and corrosion resistance. However, its wide application is limited due to its relatively poor toughness. There are many ways to toughen Al₂O₃ ceramics. This article uses micron ZrB₂ to toughen alumina ceramics, discusses the sintering process of composite ceramics, and studies the influence of process parameters on the mechanical properties and toughness of composite ceramics. The results show that the best process parameters of the two ceramics obtained by the single factor method are pure α-Al₂O₃ ceramic sintering temperature of 1500℃, molding pressure of 450MPa, holding time of 8h, ball-to-battery ratio of 1/2, and holding time of 10min; ZrB₂ (wt, 20%)+α-Al₂O₃ (wt, 80%) multiphase ceramic sintering temperature is 1450℃, molding pressure is 450MPa, holding time is 8h, ball-to-battery ratio is 1/2, and pressure holding time is 10min. Among them, the molding pressure, sintering temperature and holding time have the greatest influence on the hardness and density of the composite ceramics. The addition of ZrB₂ can increase the fracture toughness of pureα-Al₂O₃ ceramics from 5.2±0.3MPa.m^_1/2 to 6.7±0.2MPa.m^_1/2 while lowering the ceramic sintering temperature.