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We study of effecs Al-Cu-Mg/SiCp Metal Matrix Compsite (MMCs) with a matrix composition of 4.4 wt% Cu, 1.8 wt% Mg with SiCp fillers were varied (3.4; 3.7 and 4.0) wt% and the remaining Al. SiCp is mixed into Al-Cu-Mg heated at 900oC, then stir casting is carried out at 250 rpm for 10 minutes. Then cooling are carried out to room temperature. After cold, heat treatment is given and continued testing. The SEM-EDX and XRD test results showed that the increasing SiCp content, the tendency for SiCp and Mg bonds to form the Mg2Si phase increased, making the sample items enlarge and appear more coarse. While the corrosion rate test of increasing SiCp in the Al-Cu-Mg matrix makes Al-Cu-Mg/SiCp samples tend to be more corrosion resistant. The event of declining corrosive properties is due to SiCp particles occupying grain boundary areas replacing O2 (which provides corrosive properties) that are trapped in the sample during the cooling process.