Although the friction surfacing had been proposed and applied successfully in surface modification for various metals, the conventional friction surfacing process has some difficulties for applying aluminum alloy due to its specific physical characteristics, such as high thermal conductivity and relatively low strength comparing to steel materials. A novel process underwater friction surfacing has been proposed in this report to achieve stabilized friction surfacing process. Furthermore, an attempt had been made to deposit an aluminum alloy metal matrix composite (M.M.C.) coatings reinforced with alumina particles, onto a 5083 aluminum alloy plate by new process, in which a hollow rod of 5052 aluminum alloy was used with the hollow section filled with 5 μm diameter of alumina powders. The M.M.C. coatings had been achieved with uniformly distributed reinforcement particles up to 12% volume fraction.