The invention belongs to the field of the solidification and continuous casting of metal, in particular to a method of implanting small heterogeneous particles in dispersion into the molten metal in the metal solidifying process and adding material into the molten metal. The method is that a rod or a plate belt, which is composed of the metal or an alloy matrix and a metal oxide, is continuously fed into the molten metal in the solidifying process. The rod or the plate belt comprises the metal oxide whose weight percent ratio is 0.2 percent to 6 percent and the size is 10nm to 1000nm , and is driven by a vibrating source to vibrate in small amplitude with high frequency. The part of the rod or the plate belt that is inserted into the molten metal is melt continuously, while the metal oxide of high melting point is evenly dispersed into the whole liquid phase under the effect of vibrating and fluid flowing, which makes the solidified metal organization obtain large quantity of small particles distributed in dispersion. These small particles not only bring large quantity of nucleation cores to axialite such as the solidification of the molten metal, but also take effective restraint effect on the phase change, the heat treatment and the welding of the grain growth in the following metal processing.