Dispersed silver nanoplates were prepared using silver nitrate and vitamin C in absence of agitation and surfactants in aqueous solution. In contrast, aggregated silver nanoparticles were obtained under mechanical agitation. The morphology and phases of products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffractometer (XRD). The results show that the dispersed silver nanoplates can be obtained under the conditions of no mechanical agitation and no surfactants. The shear will induce the formation of aggregation.