Superfine aluminum oxide powder after pretreatment was used as reinforcement.The as-pretreated aluminum oxide powder was treated with electroless plating copper assisted by ultrasonic field.The copper matrix composites reinforced by alumina oxide were prepared by powder metallurgy.The samples were characterized by X-ray diffractometer（XRD）

scanning electron microscopy（SEM）and energy spectrum analyzer（EDS）.The results show that the aluminum oxide particles are uniformly dispersed into copper matrix composites.In addition

the influencing factors of the sintering process on the physical properties of the composites were analyzed by the orthogonal testing.The optimized processing parameters are as follows:the sintering temperature of 900℃

the sintering pressure of 600MPa and the aluminum oxide content of 2%

respectively.