Aluminum matrix nanocomposites reinforced with ceramic particles due to appropriate mechanical and physical properties are widely used in various industries such as military, automotive and aerospace. These industries require light materials which could work for long time and also at high temperatures. So far, silica nanoparticle hasn’t been used as a reinforcing phase for metal matrix composites. In this research, aluminum-aluminum/nano-silica synthesized using powder metallurgy rout as well as powder in tube method, then hot extrusion process and investigation of components properties successfully completed. For this purpose, the effect of nano-silica powder percentage in the aluminum/nano-silica composite and the percentage of nanocomposite powder inside the tube in powder in tube method were investigated. In this regard, firstly, nano-silica powder with aluminum powder were mixed by planetary ball mill for two hours and then poured and compacted inside a pure aluminum tube. Powder in tube samples were sintered at the desired condition and then extruded at 400 ?C. Similarly, reference samples using pure aluminum powder were prepared, then components properties were evaluated. Microstructural investigations, as well as the interface between the sheath and core using optical microscopy and scanning electron microscopy were performed. After hot extrusion mechanical properties of the developed materials were investigated by employing macro- and micro-hardness, density, tensile, cold compression and hot compression tests. According to the results there were no evidence of reaction between Al and SiO 2 and formation of any new phase during ball milling process. Experimental tests on aluminum matrix composite, reinforced with nano SiO 2 particles revealed that hardness and tensile strength increased 42% and 25%, respectively by addition of only 1%wt SiO 2 nanoparticle. Also the results showed that in powder in tube samples tensile strength for aluminum-aluminum/nano-silca were increased 25% comparing with aluminum-aluminum samples. Microscopic images showed that by using hot extrusion process the interface between sheath and core has no defects and is continuous. Keywords : Metal matrix nanocomposite, Macro composite, Powder metallurgy, Hot extrusion, Powder in tube.