Abstract: The pressure properties , Vickers hardness and sliding wear-resistance of 1. 5～5 vol % SiC_P (130 nm) / Al(149～75μm) mat rix composites fabricated by powder metallurgy and hot ext rusion were investigated to research theeffect of submicrometer SiC_P dispersed in alumina mat rix on the wear behaviour. The result s show that increase inthe volume f raction of SiC_P causes Vickers hardness increasing. It s Vickers hardness is 28. 4 and 33. 3 when thevolume f raction of SiC_P (130 nm) is 1. 5～5 vol %. The pressure properties of the material are 170 MPa and 186 MParespectively. Under the higher load , the sliding wear - property increases with increasing the volume f raction ofSiC_P ; 1. 5 vol % and 5 vol % SiC_P / Al composites have higher sliding wear-behavior than 61520. 4 bronze bearing material and Al. An excellent wear-resistance microst ructure consisting of aluminum mat rix and minute hole and homogeneous dist ribution SiC_P is formed in the wear surface of SiC_P / Al mat rix composites.