The effects of carbon content on the crystal structure, the lattice parameters, the density and the average particle size of the lithium vanadium phosphate cathode materials (Li3V2(PO4)3) were investigated. It is found that amorphous carbon can not change the crystal structure and the lattice parameters of the Li3V2(PO4)3 cathode materials, but it has effects on their density and the average particle size. The density and the average particle size of the Li3V2(PO4)3 are both reduced as the carbon content is increased. In addition, the electrochemical performance of the Li3V2(PO4)3 cathode materials was tested in CR2032 button battery. The tests show that when the materials are charged/discharged at low C-rate, their electrochemical performance is improved gradually as the carbon content is increased and it becomes best at 10% carbon-content; the materials require more carbon as the C-rate is increased