Fabrication of metal matrix composites(MMC_s) by casting processes are very promising of manufacturing near net hape components at a relatively low cost. One of them, the squeeze casting technique has characteristics such as fine microstructures as a result of the rapid cooling, low porosity and a good bonding between particle and base alloy. Therefore, this paper has been made to examine the microstructure and mechanical properties of fabricated Al-15%SiC_p composite by melt-stirring and squeeze casting method. Correlations between fabrication conditions and homogeneous dispersion of particles are investigated for SiC_p reinforced Al composites. The manufacturing parameters to homogenous mixing are crucible size, impeller size, temperature of molten metal, stirring time and stirring speed in melt-stirring process. The composites slurry containing SiC_p are pouring into a pre-heating die, and applied pressure in squeeze casting. The reinforcement dispersion state and fracture surface will be observed by the optical microscope and SEM. The primary product of MMC_s billet is prepared by squeeze casting condition for variation of applied pressure 70, 100, and 130㎫. By employing observed results systematically, correlation is proposed among the microstructure, particles behavior, mechanical properties and the processing parameters for an optimum melt-stirring and squeeze casting process of MMC_s