By taking common three-phase asynchronous motors for objective, a motor model was established, and the stator iron cores of the asynchronous motor was prepared by the Fe-based amorphous alloy and silicon steel, respectively. The performance and characteristics of stator iron cores made of Fe-based amorphous alloy and silicon steel were researched. Then, the alternating current losses and coercive forces of two kinds of iron cores were also tested by a soft magnetic testing system. Test results show that the alternating current loss of the amorphous core is only 1/3 that of the traditional silicon steel core, and its residual magnetism is only 1/4 that of the traditional one under the same frequency and magnetic induction intensity. These data indicate that the alternating current loss and coercive force from the former are far less than that of the latter and the higher the working frequency is, the greater the difference between the two data is, showing that amorphous material has more excellent soft magnetic characteristics than silicon steel materials. Moreover, a finite element analysis model for the three-phase induction motor was established, and the characteristics of the motors made of two different materials were calculated. Results show that the characteristics and efficiency of the motor with the amorphous alloy core are much better than that of the motor with the silicon steel core. These results presented have important significance for the further study of the amorphous motors.