This research is based on ¡§GTAW¡¨ mode, toweld the premixedferrite, molybdenum, and carbon powders on SC45 carbon steel substrate. Learning from the previous experiments, a wear test under a high temperature of 450¢J, was employed to get the Ring-disk coefficients of sliding friction about 0.3, the depletion amounts to 0.67 mg Nm per million, that exhibited a better hardness and anti-wear property than the substrate. The welding layer¡¦s solidification structure was examined by XRD,SEM, EPMA and TEM. The experimental results revealed that in the layer welded with GTAW, primary dendritic arms are of eutectic solidification structures. In X sample, £]-Mo2C is located in the dendrite closed to the un-melted zone. We can see that £^ phase (dispersed phase) with the rod shape solidified in the dendrite. And then £b-Fe3Mo3C (continuous phase) solidified between the rod spacing. In Z sample, £b-Fe3Mo3C solidified as dendrite first, and then the £^ phase solidified between the inter-dendrite. The solidification path is ¡§£\ + L ¡÷ £\ + £^ + L ¡÷ £\ + £^ + L+ £b ¡÷ £^ + £b¡¨. £^ phase and £b-Fe3Mo3C are both FCC structures in an ordered phase, and the coherence of lattice is good, with a perfect orientation relationship.