Abstract: The sol-gel method is used to prepare FeCo@ZrO₂ absorbent by the combination of zirconia and FeCo. Vector network analysis is used to characterize the electromagnetic parameters and absorbing performance of FeCO@ZrO₂ before and after high temperature treatment. The results show that the dielectric constant of FeCo@ZrO₂ absorbent modified by coating is significantly reduced. The impedance matching characteristics and absorbing performance of the FeCo@ZrO₂ absorber are improved. The modified FeCo@ZrO₂absorber still has significant absorbing performance after high temperature treatment, and its reflectivity simulation curve remains below -10 dB at 7-9 GHz.