Polymerization of acrylamide (M) in the presence of ultrasound and peroxomonosulfate (PMS) was carried out for the first time for various concentration ranges of monomer and initiator and various temperatures at a constant frequency of 1 Mhz. The rate of polymerization R-p was found to increase with increase in the concentration of monomer and initiator and found to depend on [M] and [PMS](1/2). The rate of disappearance of initiator (-d[PMS/dt) was also followed simultaneously under the experimental conditions and found to increase linear ly with increase in [PMS]. A probable reaction mechanism was proposed on the basis of the observed results, and the individual rate constant were evaluated.