This paper describes a dry composite process, in which fine α-Al2O3 ceramic guest particles with a mean size of 150 nm were mechanically compounded with metal Cu host particles with a mean size of 25 μm by embedding and curling the guest particles on the surface and inside of host particles using mechanical alloying (MA) and micron/nano particles composite system (PCS). The optimum rotor speed and processing time were determined according to the treatment effect under different conditions. Particles size and other features were investigated. Particles size decreased quickly, and bulk density and tap density of the composite particles increased noticeably under appropriate process conditions. Al2O3/Cu composite material was fabricated via using hot-press sintering technique in argon shield. Microstructure of the composite material was studied by SEM, and the results have shown that a-Al2O3 particles distribute evenly in Al2O3/Cu composite material, which also proved that Al2O3/Cu composite particles could be fabricated perfectly by MA & PCS.