Abstract: Through adding different contents of Mn into Al-2%Fe alloy,carrying through electromagnetic experiment and casing samples,the morphology of the primary Al3Fe phase and mechanical properties were investigated.Mn has obvious influence on the shape of iron-rich phase,which changed from the needle-like to needle plate-like and particle-like.When the molar ratio of Mn/Fe=1.3-1.5,the modifying effect is the best.The tensile strength is raised by 20-30 MPa after adding Mn,the tensile strength is 126 MPa without Mn,the elongation is up to 22.9%.After the modified melt was acted in magnetic filed,the iron-rich phase move to the pipe wall and is removed because of the electromagnetic repulsion force.The melt is mainly aluminum.Therefore the tensile strength declined to 131 MPa,but the elongation is enhanced further,up to 29.2%.