Abstract In the present research work was searched the influence of severe plastic deformation (SPD) realized by ECAP procedure on structural, mechanical and plastic properties of Al-Al4C3 composite material. The ECAP process doesn’t influence samples shape and sizes and produced ultrafine nanocrystalline structures. Following composite material was prepared by mechanical alloying. Composite granulate was extruded in die with 94% reduction at temperature 550°C. Extrusion in ECAP die was made at ambient temperature. Severe plastic deformations were effected the increase of strength properties (Rm, Rp0,2 ).Strength properties were increased from 1.3 till 1.4 multiple, but plastic facilities were decreased and hardness was risen, in comparison with initial material state. The great decrease was searched in grain size diameter, where diameter of grain size was decreased from initial value 1 ?m up to ultrafine level 0.6 ?m after ECAP deformation. The change in grain size diameter was made by redistribution of dislocation substructure and deformation slips in initial grain. Valuation of fracture surfaces was mentioned on their large segmentation. The fractures were classified look like transcrystalline ductile fractures with two quantitative ranks of holes. Small holes with diameter bellow 1 ?m they were initiatives by Al4C3 elements, where had size up to 200 nm. Large holes with diameter above 2 ?m were results of sizeable elements initiation, or clustering of small elements, resp. residual pores. With ECAP procedure in investigation Al-Al4C3 composite material samples was achieved ultrafine nanostructure at level 0.6 ?m.