On the basis of Zeta value measurement of the silver nanopowders prepared by DC arc plasma evaporation, the influences of supersonic dispersing time and surfactant concentration on the dispersing properties in alcohol solvent were studied systematically for the silver nanopowders by using polyvinylpirrolidone (PVP), cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulphate (SDS) and oleic acid as surfactants. The results show that the suspension dispersion effects increased up to a maximum, then decreased with the increasing of ultrasonic dispersing time, similar to the increase of surfactant concentration. PVP is the best dispersant for the four kinds of surfactant using in the experiments, the optimum dispersing condition is PVP of 1.5wt% for the ultrasonic dispersing time of 40 min.