Abstract: Preparation of Fe-based amorphous nanocrystalline soft magnetic materials has received much attention in a variety of fields.The double phase structure and the quality of Fe-based nanocrystalline soft magnetic materials and its application are introduced;the advantage and disadvantage are compared between the traditional annealing crystallization and preparation of the crystallization by laser.The significance,theoretical value and some unsolved problems about the technique of nanocrystallization by laser are presented.Finally,the need study key problems and direction of this preparation technology are presented.