The silica ceramic doped Li2O-K2O-Al2O3 was sintered using the solid state reaction technique. The samples at different sinter temperatures were analyzed by microwave network analyzer, SEM and XRD etc. It was found that the ceramic doped Li2O-K2O-Al2O3 almost melt into glass state when sintering. The microstructure of the ceramic was pyknotic and the dielectric properties were pretty good. At the measured frequency of 1 MHz, the dielectric constant were 5.45～5.87 and the dielectric loss were 0.004 1～0.005 4. At the measured frequency of 14 GHz, the dielectric constant were 4.37～4.58, the dielectric loss were 0.003 8～0.005 3. The ceramic had the best dielectric property at the sinter temperature of 1 350 ℃. The bending strength of the silica ceramic doped Li2O-K2O-Al2O3 was much better than the silica ceramic without doping. The bending strength was all above 145 MPa, or even to maximum 163 MPa. The silica ceramic doped Li2O-K2O-Al2O3 had the potential to be one of the radome materials.