Aluminum matrix composites reinforced with carbon fiber have attractive properties for many modern structural elements. In addition, carbon fibers are cheaper and more accessible than other ceramic fibers, which results into lower manufacturing costs of new materials. The main problem limiting the development of these materials is poor wettability in the Al-Cf system. In addition, the reaction of molten aluminum with carbon formed Al4C3 brittle phase. A large mismatch in thermal expansion coefficients between aluminium and carbon can generate internal stress at the stage of manufacture. These disadvantageous phenomena can significantly limit the strength of the composites. Achieving durable bond on reinforcement-matrix boundary significantly determines the mechanical properties of composite material. Reducing adverse reaction in Al-Cf system is possible by selection of technological process parameters (such as time, pressure and temperature), the application of protective coatings on the fiber and matrix alloy chemical modification. For the manufacture of composites AlMMC / Cf are used mainly pressure infiltration method: high-pressure die casting and squeeze casting, for the large-batch production series and gas pressure infiltration (GPI) for production of prototype and short series. The article presents the influence of chemical composition on the structure and properties of the alloy matrix composites produced by the GPI .The studies were supported by Polish Ministry of Science and Higher Education and by DFG in Germany as the Polish- German Bilateral Project “3D-textile reinforced Al-matrix composites (3D-CF/Al-MMC) for complex stressed components in automobile applications and mechanical engineering”