The high-density Li0.95Na0.05FePO4 cathode material was synthesized through microwave heating, using a spherical sample prepared by co-precipitation method as precursor. The morphology, structure, electrochemical performance and the tap density of the materials were characterized by scanning electron microscope (SEM), x-ray diffraction (XRD), cyclic voltammetry (CV), constant current charge-discharge experiment and the tap density measurement. The results indicated that the samples have rules spherical or similar spherical morphology and simple pure olive-type phase. The Na doped Li0.95Na0.05FePO4 material showed excellent performance with a tap density of 1.63g/cm3. At room temperature, its initial discharge capacities reached 164.2 mAh/g, 151.5mAh/g, 130.5mAh/g at 0.2C, 1C, 2C current rates, respectively.