In this review we studied the synthesis of metal NPs and nano composite with various chemical reductants and optical & optoelectronic properties of them. By choosing appropriate reducing agents, surfactants and applying suitable condition we can synthesis the metal NPs of different morphology. Surface Plasmon Resonance (SPR) peak of metal NPs is shifted with size of the particles. The optical and optoelectronic properties of nano composites is completely different than that of the component materials. Significant enhancement of optoelectronic properties of nano composite is also observed in our study.