Abstract: For making powder alloy, the riscosity and surface tension of liquid alloy are analysed and determined. Different atomization processes are put into operation in laboratory scale. A complex process of argon atomization and air cooling showes to be suitable for that purpose. The product of rare earth alloy powder is with a sizes of 0.2mm~2.0mm and good fluidity. For analysing the mechanism of atomizing process, a high speed photographic technology is used.