This work had been carried out to analyse the consequence on copper on the microstructure along with mechanical properties of A356 alloy. This metal matrix composite had been investigated by powder metallurgy. This generally involves three foremost stages: blending of the metal and ceramic powders, pressing or cold compaction, and sintering. These last two steps are often combined during hot pressing. One of the advantages of PM evaluated for casting is having better control on the microstructure, where better giving out of the reinforcement is possible in PM compacts. Particle size and the quantity of reinforcement had well-defined effect on the mechanical properties of composites. Proper addition of reinforcements to aluminium composites had a positive effect on mechanical properties, such as hardness, strength and wears resistance. The difference composition of Nano sized copper content is supplementary 1wt%, 3wt%, 6wt%. The average size of aluminium and reinforcement particle size 60µm and 80nm respectively. For Proper fabrication of the powder which was to be found in planetary ball mill. The sintering Temperature and time are in the range of 600-610ºc for 90-120 min the results that exhibited at elevated sintering temperatures, lower porosity is obtained. Higher relative densities were attained at higher sintering temperature. Higher hardness was observed in samples containing finer copper particles. The addiction of the diffusion to time may be explained for sintering temperature. It could be seen that the atomic dislocation is comparative to the square basis of time. This is responsible for the atomic diffusion leading to grain coarsening. It is seen that, at superior sintering temperatures, a denser formation is formed due to elevated dispersal rates.