Experimental result of microwave Li-Mg ferrites is reported. These ferrites are fabricated by substituting （Mg2+Ti4+）1/2for Fe3+ ions in the Li ferrites and suitably adding some other metallic ions. This Li-Mg ferrite system is characterized by simultaneously high remanence ratios

low coercivity

low microwave loss and high peak power capacity. The saturation magnetization 4π Ms of this system may be adjusted between 200-3000Gs with dielectric loss tgδe = 2-9×10-4 and peak power handling capacity above one megawatt.