Cu-Al2O3 composites with different oxygen resource coefficients were prepared by a new simplified internal oxidation technique. The microstructure of the composites was observed by SEM （scanning electronic microscope） and TEM （transmission electronic microscope）. The results show that amounts of fine γ-Al2O3 particles with 5

2

0 nm in diameters and about 25

6

0 nm in spatial distance among particles are dispersively distributed into the Cu matrix

verifying the successful preparation of the Cu-Al2O3 composites. The internal oxidation of compressed Cu-Al alloy powder is fully completed with the oxygen resource coefficient of 1.20 after sintering at 950℃ for 4 hours

which reveals the optimum oxidant content for internal oxidation is oxygen resource coefficient of 1.20.