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The vacuum gas pressure infiltration was performed for the continuous Al2O3f/Al composite with the volume fraction of 40%, of which the reinforced material was Nextel610-Al2O3 fiber, Al2O3 fibers were extracted using NaOH solution, the matrix alloys were 1A99, ZL210A, ZL301 and 7075 alloys, the effects of matrix alloy on the density, fiber damage and tensile strength of continuous Al2O3f/Al composites were studied. The results showed that different matrix alloys have obvious influence on the density and microstructure of the composites. The density of continuous Al2O3f/ZL301 composite is highest as 99.2%, and it has the least defect, the density of continuous Al2O3f/1A99 composite is lowest as 96.8%, the main reason for this difference is the wettability between the matrix and the fiber is different. The degree of interface reaction between different matrix and fiber is different. Eventually, the damage degree of the fiber is different. The tensile strength of continuous Al2O3f/1A99, Al2O3f/ZL210A, Al2O3f/ZL301 and Al2O3f/7075 were 465MPa, 479MPa, 680MPa and 389MPa, respectively. The defect, interfacial reaction degree and the fiber damage are the main factors to determine the tensile strength of the composite.