Abstract: The new way of the ball milling-spray-stirring process was used to fabricate nano-Al₂O₃ particle (Al₂O_3p)/Al(7075) composites and the spray-stirring device was designed which can inject continuously a spot of nano-Al₂O_3p into the Al melt. The effect of nano-Al₂O_3p reinforcement on the microstructure of Al(7075) matrix alloy was observed, and the wear characteristics of Al(7075) matrix and nano-Al₂O_3p/Al(7075) composites were tested. The wear characteristics of the nano-Al₂O_3p/Al(7075) composites and Al(7075) matrix were measured at various loads(15 N, 25 N and 35 N). The results show the nano-Al₂O_3p/Al(7075) composites appears as fine grain, and the distribution of the reinforcement in the matrix is uniform, and well bonded with the matrix. As the load increasing, the wear lose of the nano-Al₂O_3p/Al(7075) composites is slower than the Al(7075) matrix. When the load is 35 N, the nano-Al₂O_3p/Al(7075) composites exhibite smaller wear width and wear debris. The improvement of the wear resistance of the nano-Al₂O_3p/Al(7075) composites occurs mainly by supporting of the Al₂O_3p and strengthening of the fine-grain.