Composite powders of nanocrystalline WC-10Co (15wt%), Y 2 O 3 (8mol%) stabilized nanocrystalline ZrO 2 (30wt%), industrial cobalt powder (4.5wt%) and submicron Al 2 O 3 (55wt%) composite powders were fabricated by high-energy ball-milling process. The nanocomposite powders were consolidated by microwave sintering process at temperature ranged 1300 ℃-1550 for 15 min, ℃ respectively. The optimum consolidation conditions, such as temperature, were researched during microwave sintering process. Vickers Hardness of the consolidated cermets was measured by using a Vickers indentation test, and density of specimens was also determined by Archimedes' principle.Microwave sintering process could not only increase the density of Al 2 O 3 -ZrO 2 -WC-Co cermets and reduce the porosity, but also inhibit abnormal grain growth.