Abstract The optical properties of sliver nanoparticles originate from the oscillations of conduction electrons when excited by electromagnetic radiation ; termed surface plasmon resonances. When the size of nanoparticles is much smaller than the wavelength of light, the electromagnetic eld is uniform across a particle such that all the conduction electrons move in phase producing only dipole type oscillations. manifested by a single, narrow peak in the SPR spectrum. As the size increases, the eld across the particle becomes nonuniform, and this phase retardation broadens the dipole resonance and excites quadrupole resonances. In this graduate project work, we reviewed the comparison of dipole and quadrupole plasmon band contribution for size 10-100nm of sliver nanoparticles and the di erence in optical properties between bulk material and nanoparticles. The nanoparticle silver was characterized by ultravioletvisible spectroscopy, transmission electron microscopy, atomic force microscopy, and dynamic light scattering. Key words : Sliver nanoparticles, Dipole ,Quadrupole, Characterization techniques of sliver nanoparticles .