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To verify the effect of Al2O3 particle content and size as an abrasive on resin matrix friction materials for mining equipment,the tribological performance of friction materials was studied by using a block-on-ring tribotester over a wide range of applied load and sliding speed.The testing conditions simulated brake conditions of mining equipment.The antiwear property of nano-Al2O3 was superior to that of micro-Al2O3 for friction materials.The friction coefficients of specimens increased with the increase of nano-Al2O3 content.The wear rates decreased with increasing nano-Al2O3 content.The wear rates of specimens containing nano-Al2O3 was about 2-8 times lower than that of specimen with micro-Al2O3.The specimen with 10.5 vol％ nano-Al2O3 showed the best tribological properties.The wear mechanism of specimens with nano-Al2O3 was abrasive wear and plastic deformation.