This review paper summarizes the recent work in field of different types of Micro and Nanoparticle particles dispersion test results in different polymer matrix composites and reporting its excellent performance in mechanical, electrical and thermal applications. The discussion concentrates on different types of dispersion technique used for Micro and Nano fillers because the dispersion of particles is key problem in composites industrialization. This review has been focused on the effect of physical phenomenon of dispersion, relation between dispersion and physical properties of micro and nano-particle on mechanical and other properties of composites. Several approaches that may be applied to overcome the dispersion of particles are described in this review.