Microstructure and wear characteristics of SiCp /Al - 6.5wt%Si - 1.7wt%Mg composite materials fabricated by rheo-compocast and hot press were investigated in this study. The results obtained are as follows : 1) It was possible to fabricate favorable composite materials containing SiCp which is up to 26 vol% by rheo-compocast and hot press. 2) Si and Al₂Si₄O_(10) were formed on the surface of SiC particles, and fairly good bonding condition was obtained on the interface between SiCp and matrix alloy. 3) Wear mechanism was transformed into adhesion, oxidation and fusion on the matrix alloy as wear rate increases, but in the composite material, the abrasive mechanism was shown not depending on the wear rate. 4) Wear resistance was improved as the amount of SiCp increases, however, no remarkable change in wear resistance was found above 8vol% of SiCp.