Amorphous ribbons (Fe1-xCox)86Hf7B6Cu1 (x=0.4~0.6) were prepared using the single-roller melt-spinning technique. M?ssbauer Spectroscopy, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM) were used to characterize microstructures and soft magnetic properties. The result confirms the fully amorphous state of the as-quenched alloy. The valence electron structures and the magnetic moment of the amorphous alloys were calculated using the method of Bond Length Difference (BLD) of the Empirical Electron Theory of solids and molecules (EET). The error of the computed value in theory and experimental value of the magnetic moment is less than 10%, which satisfies the demand of first approximation, indicating that magnetic moment calculation of amorphous alloy could be realized on the valence electron level.