With the rapid upgrade of power equipment towards high frequency, miniaturization, and high power, the performance shortcomings of traditional ferrite cores have gradually become prominent. High frequency losses, poor temperature stability, and inability to adapt to high frequency and high power operating conditions have made it difficult to meet the needs of high-end equipment. Nanocrystalline magnetic cores, with their excellent high-frequency characteristics, ultra-low losses, and strong adaptability to miniaturization, are rapidly replacing traditional ferrite products and becoming the core supporting components for high-frequency inductors, precision transformers, and high-frequency power supplies. In high-frequency operating conditions above 200kHz, the loss of nanocrystalline magnetic cores is much lower than that of ferrites, and they have smaller volume, better heat dissipation, and stronger anti-interference ability, perfectly adapting to the needs of AI equipment, intelligent industrial control, and new energy vehicle high-frequency equipment. In the future, with the continued popularity of high-frequency devices, the replacement space for nanocrystalline magnetic cores will continue to expand.