Abstract: In order to obtain the micronorder spherical silver powders that are narrow in size distribution and have smooth surfaces,the seed growth phase and silver particle aging phase were optimized in the process of silver powder preparation.The morphology,tap density,true density and surface crystal structures of silver powder were characterized by scanning electron microscope,X-ray diffractometer and specific surface area analysis.The contributions of ultrasonic cavitation to the morphology of the silver powder were studied.Under dual conditions of hydrogen peroxide addition and ultrasonic treatment,the silver powder with narrow size distribution(2-3 μm) and smooth surface is obtained.The method is effective in narrowing the silver powder particle size distribution and improving the surface smoothness.