Ceramic reinforced nanocomposites are widely used in martial, aerospace, vehicle and other industries due to appropriate mechanical and physical properties. In this research, several Al/nano-silica composites were manufactured by compressing method and the resultant properties were investigated. The weight percentage effect of nano-silica powder in Al/silica nanocomposites was also investigated. First, nano-silica and aluminum powder were poured in a mold and compressed. The compressed samples were evaluated after sintering. The mechanical properties of the produced specimens were evaluated using the tensile test at ambient temperature. Microstructural studies as well as the examination of the none-etched intersection after the sintering process were performed using light electron microscopy. The results showed that adding one percent of nano-silica to aluminum matrix causes a significant increase in mechanical properties of nanocomposite compare to pure aluminum and the ultimate tensile strength increased by 16 %. In contrast, the addition of nano-silica causes 51% reduction in elongation of nanocomposite sample compare to pure aluminum sample. Also manufacturing Al/nano-silica nanocomposite without sintering operation is not possible and changing temperature, time, and sintering atmosphere have a significant effect on the mechanical properties of the ultimate specimens. Then, the modeling of Al/nano-silica nanocomposite was performed using the finite element method to confirm and interpret the experimental results. In these simulations, the ductile damage model was used to determine the behavior of Al/nano-silica nanocomposites. The results show that adding nanoparticles cause an increase in yield strength of nanocomposite that shows a good agreement with experimental results. The numerical results show that with increasing nanoparticle percentage, damage parameter is significantly reduced. Keywords: Nanocomposite, Aluminium, Nanosilica, Powder, Finite Element Softwares, Damage Mechanics