Abstract：A kind of Fe base amorphous alloy powder which contents some Si, B, Cr, Ni etc. was used as plasma spraying raw material, the experiment results show that, a very high amorphous content Fe base alloy coating can be fabricated by air plasma spraying. The coating has homogenous microstructure and contains only a little micro pores and oxides. The coating has high hardness and the micro hardness is 530~790Hv0.1. The amorphous alloy coating has a well combination with the A3 steel substrate, and the adhesion strength is about 27MPa. These results indicate that the Fe base amorphous alloy coating has a fine quality, and can meet the application request.