Abstract: In order to refine the structure of deposited metal and control the morphology and distribution of hard phases in surfacing deposited metal, DC transverse magnetic field was applied to the carbon arc surfacing of Cr-B-Ni-V iron based alloy system.The influence of magnetic intensity on hardness and wearing resistance was obtained through analyzing the hardness, wearing and microstructures of the surfacing deposited metal.The results show that the surfacing deposited metal of introducing magnetic field has higher hardness and better wearing resistance than the surfacing deposited metal without magnetic field;the properties of surfacing deposited metal are optimal when magnetic field current is 3 A, and surfacing current is 180 A, and surfacing speed is 12cm/min.The hard phase in the surfacing deposited metal is fine and even, hexagonal in shape.Mean while the orientation of them is consistent.