Abstract: Nonmagnetic Fe-Mn alloy powders were prepared by water atomization method. The influences of manganese contents by mass and water atomizing parameters on the properties of Fe-Mn alloy powders were investigated. The results show that, the nonmagnetic Fe-Mn alloy powders can be prepared by water atomization process when the manganese content by mass is below 24%. Under the laboratory conditions, the effect of atomizing pressure on loose density of Fe-Mn alloy powders is negligible, but the flow ability of powders gets worse when the atomizing pressure increases. The best properties of loose density and flow ability are achieved when the atomizing pressure is 15 MPa. The higher atomizing pressure can improve the sintering density of alloy powders, thus, on the premise of flow ability, the sintering density can be improved by increasing the atomizing pressure.