By employing the DR-S02 planar material shielding effectiveness tester,the electromagnetic shielding properties of MgGd-Y-Zn-Zr rare earth magnesium alloys were studied,and a comparison of electromagnetic shielding property under different extrusion deformation degree was made. The results show that the electromagnetic shielding property of Mg-Gd-Y-Zn-Zr rare earth magnesium alloy is high,and the property can be changed through extrusion deformation. In the low frequency band,the hot extrusion has little ef...