The oxidation behavior of Fe-based amorphous ribbons was tested by annealing at 380 ℃in air for different time with heat treatment furnace and analyzed by X-ray photoelectron spectroscopy(XPS)and scanning electron microscopy(SEM).The mechanism of oxides formation of the amorphous ribbons was discussed in detail.The results showed that the oxides were mostly B_2O_3,SiO_2 and Fe_2O_3or FeO.With the increase of annealing time and holding temperature,the fraction of the oxides on the ribbon surface increased and the size of the oxides became larger due to the generation of new oxides and the coalescence of small oxides.The oxides have different shapes,such as round,rod and needle-shaped.Experimental results also showed that the oxides nucleated at fish scale,air pocket and impurities in priority,and the growth of the oxides was controlled by the diffusion of atoms.With the increase of the distance to the ribbon surface,the oxygen concentration decreased dramatically.Due to the low binding energy of B_2O_3 and the large diffusion coefficient of B atom,the B element was oxidized firstly compared with other elements.Moreover,the oxidation depths of the B_2O_3 and SiO_2 were larger than that of Fe_2O_3. The oxidation behavior of Fe-based amorphous ribbons was tested by annealing at 380 ° C in air for different time with heat treatment furnace and analyzed by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The mechanism of oxides formation of the amorphous ribbons was discussed in detail. The results showed that the oxides were mostly B 2 O 3, SiO 2 and Fe 2 O 3 FeO.With the increase of annealing time and holding temperature, the fraction of the oxides on the ribbon surface increased and the size of the oxides. larger due to the generation of new oxides and the coalescence of small oxides. The oxide has different shapes, such as round, rod and needle-shaped. Experimental results showed that the oxides nucleated at fish scale, air pocket and impurities in priority, and the growth of the oxides was controlled by the diffusion of atoms .With the increase of the distance to the ribbon surface, the oxygen concentration decreased dramatically .Due to the low bindin g energy of B 2 O 3 and the large diffusion coefficient of B atom, the B element was oxidized firstly compared with other elements. Moreover, the oxidation depths of the B 2 O 3 and SiO 2 were larger than that of Fe 2 O 3.