With our continuing quest for lighter and stronger composites, the demand for new types of composites are increasing. In recent years various composites have been used extensively in aircraft structures, space vehicles, automobiles, and many consumer products. The main advantage of composites are the potential for a high ratio of stiffness to weight, corrosion resistance, high fatigue strength etc. Current work, in nanotechnology has produced an increasing number of possibilities for advanced materials. The most common materials used as matrix in Nanocomposites are Polymers, Ceramics, and Metals. In this book, the analysis is considered to 8th series of Aluminum AA8090 as a matrix and different types of reinforcement by using Carbon Nano tubes, Carbon Nano particles, and Carbon Nanolayers. The approach for modeling these Nanocomposites structures is that of a RVE by using the program of ANSYS. Performed various cases studying mechanical properties such as deformation, stress and strain of Nanocomposites with aligned oriented reinforcement and then make comparison between the results to see which type of reinforcement gives best performance.