A new method to decrease the residual stresses is by using nano-fillers, which is the subject of this chapter. Until now, a few research projects have been performed to reduce residual stresses in this way. This method aims to decrease the mismatch between the properties of fibres and matrix, so as to decrease the residual stresses. As mentioned before, different thermal and mechanical properties of different layers are the major reason of introduction of residual stresses in laminated composites. The residual stress in such materials depends on the CTE, Young’s modulus (E) and Poisson’s ratio (v) of constituents. Therefore, modification in any of the above properties belongs to either the matrix or fibre to decrease the dissimilarity between properties, which could result in a reduction of residual stresses. The first two factors, the CTE and Young’s modulus, are more important due to their thermal and mechanical influences, respectively ( Shokrieh and Safarabadi, 2011).