In this paper, A12O3, Al2O3-5%mol Cr2O3 and Al2O3-20%wt ZrO2 powders have been sintered to fabricate oxide ceramics with CO2 laser. The product of Al2(WO4)3 is-found as a new compound which can not be found in two-diminsional equilibrum phase-diagrams. The analysis of microstructure and hardness of the laser synthesized materials have been conducted. The hardnesses of laser synthesized materials are shown to be higher than that produced with the conventional sintering mothed in furnace.