Abstract: FeSiCr/GO nanocomposites were developed by plasma arc discharge and surface modification technology. Raman spectroscopy showed that GO was successfully compounded with FeSiCr nanoparticles. The microscopic morphology of FeSiCr/GO was characterized by TEM and then it was observed that a small amount of floccus GO was dotted on the surface of FeSiCr nanoparticles which were distributed around the layered GO, forming FeSiCr/GO nanocomposites. The adding of GO increased the conductivity and interfacial polarization of FeSiCr/GO and therefore its microwave absorbing properties were significantly improved. The simulation calculation results showed that FeSiCr/GO obtained the best microwave absorbing properties when the minimum reflection loss RL_min) reached -69.1 dB at 4.3 GHz and the effective absorption band (RL≤-10 dB) covered a frequency range of 2.6~18 GHz through adjusting the coating thicknesses from 1.1 to 5.0 mm. The improved microwave absorbing properties could be attributed to the optimized impedance matching and enhanced microwave loss capacity.