Abstract: The amorphous Fe78Si9B13 alloy was partially crystallized when it was irradiated by CO2 laser beam with 20 mm spot diameter for 20 sec at 250 W and 300 W as the laser power. The microstructures of the original amorphous Fe78Si9B13 samples and that of the crystallized samples were all analyzed by means of Mossbauer spectrum, XRD and SEM. The results showed that the amorphous Fe78Si9B13 alloy can be crystallized by 6% and 9% in α-Fe(Si) phase at 250 W and 300 W, respectively. It was found that a textural phenomenon takes place in samples, and a massive amount of grains were precipitated along (200) crystal face. The phase crystallized by laser beam forms in the crystallized surface layers of the amorphous Fe78Si9B13 alloy. Under otherwise definite conditions, the crystallized portion increases with increasing laser power.