To deal with the insulation fault caused by debris produced by amorphous alloy core, firstly, the amorphous alloy transformer 3-D model was established, then the deformation of the core was calculated ,the results demonstrated that bigger load current caused bigger vibration displacement. The debris is produced when vibration displacement exceeds the ultimate strength of amorphous alloy. Particularly, when the short circuit occurs, lots of debris was produced due to significantly vibration displacement. Then electric field distribution when debris exists was calculated, the impact of different size, quantity and the angle between debris and windings on electric field distribution were also obtained, And it is concluded that the debris generated by the iron core vibration has an influence on the insulation.