Abstract: The sample preparation methods of four corundum abrasives, namely zircon corundum (ZA), microcrystalline corundum (SG), brown corundum (A) and black corundum (BA), were studied. The samples were prepared by direct grinding with ultra-fine resin diamond wheel and manual polishing. The surface roughness, microhardness and surface morphology were compared and analyzed. The quality and efficiency of two kinds of sample preparation methods were studied, and the process parameters of direct grinding of four kinds of corundum abrasive samples were optimized. The results show that the surface roughness R_a,R_z and microhardness of corundum abrasives by direct grinding are basically the same as those by manual grinding, while the efficiency of the former is at least double times higher than that of the latter; ZA, SG and A can meet the microhardness test requirements by directly selecting the coarse grinding and fine grinding processes, while BA abrasives require two additional spark-our grinding processes to meet the microhardness test requirements on the basis of coarse grinding and fine grinding processes.