“Fe-6.5Si alloy was prepared using directional solidification technology, and the effect of pulling speed on the microstructure evolution, mechanical properties, and magnetic properties of the alloy at the initial start-up of directional solidification was studied. The results indicate that the columnar dendrites in the annealing zone at the front end of the initial start-up interface of directionally solidified Fe-6.5Si alloy grow parallel to the pulling speed direction, and the transition zone consists of large block shaped grains. The front end of the initial startup interface of the alloy is mainly composed of A2 phase and (B2+D03) layered structure, and the content of layered structure decreases from bottom to top (B2+D03). As the pulling speed increases, the content of (B2+D03) layered structure in Fe-6.5Si alloy increases, the magnetic polarization strength of the alloy first increases and then decreases, and the average hardness value of the ingot increases.”