A self-shielded flux with Fe,Cr,Ni and so on was welded onto 45 steel substrate and prepared to iron-based surfacing welding coating. The macro-morphology and welding process conditions were assessed. The phase composition and microstructureof the surfacing coating were characterized. And it ’s hardness, wear resistance, corrosion resistance, thermal stability, crack resistance, self-protective properties,etc were studied. The results show that welding coating contains amorphous, with good wear-resistant, crack resistance, corrosion resistance, and good thermal stability, welding process performance, excellent comprehensive properties.