Iron core is the main magnetic circuit in the transformer. Nanocrystalline material has outstanding comprehensive magnetic property, high saturation magnetic induction, high initial permeability, low Hc and low high-frequency loss under high magnetic induction, being excellent material for transformer core. The transformer with a iron core made of amorphous alloy strip is a new type of energy-saving transformer. Amorphous alloy core transformer has obvious performance of energy-saving and environmental protection, and it is a new generation of long-term product in distribution network.