Abstract: The Fe5 alloy was overlaid on low carbon steel by plasma arc surfacing with DC longitudinal magnetic field and DC transverse magnetic field,respectively.The magnetic field current and surfacing current were changed during surfacing.After PLA with magnetic field,the OM,wear loss test,micro-hardness test were used to analyze the effect of magnetic field style on microstructure and properties of deposited metal.The difference and mechanisms of magnetic field style and parameters on properties and microstructure of deposited metal were researched.The results indicate that the introduced longitudinal and transverse magnetic field can increase the nucleation ratio of hard phase and improve the properties of deposited metal.The distribution of hard phase is random under the transverse magnetic field,but it is hexagonal under longitudinal magnetic field.So the effect of DC longitudinal magnetic field is better than that of DC transverse magnetic field on wear resistance of surfacing layer,the effect of DC longitudinal magnetic field is worse than that of DC transverse magnetic field on hardness of surfacing layer.