This study systematically investigates the gas adsorption characteristics of silicon carbide (SiC) as a potential contributor to defects, including shrinkage and porosity, in SiC particle reinforced Aluminum (SiCp/Al) composites. Key factors affecting these composite materials defects such as SiC particle size, gas atmosphere, and gas pressure, are comprehensively explored. The research begins by elucidating the mechanism through which the melt absorbs gas during the processing flow. Additionally, mathematical models correlating [O] growth with temperature and [N] peak contentwith gas pressure are established. The paper concludes by proposing effective strategies to diminish defects and enhance the purity of composite materials. These strategies include reducing melting time, decreasing melting temperature, increasing the vacuum during melting, and implementing high-temperature degassing.