To improve the electrochemical performance of Li₂FeSiO₄ with low electric conductivity, the Li₂FeSiO₄/C composite materials were synthesized by a vacuum solid-state method. Compared with Li₂FeSiO₄, the carbon-doping samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser scattering technology (LS) respectively. There were no significant changes in the structure and morphology of the products before and after carbon doping, except for slight decrease of particle size and increase of Li₂SiO_3impurity. The results of constant current charge-discharge and capacity intermittent titration technique (CITT) showed that the crystal structure of Li₂FeSiO_4had been rearranged after several charge-discharge cycles (at least 5 cycles). Moreover, the improved Li+ conductive capacity enhanced the electrochemical performance of Li₂FeSiO₄ cathode. However, the effect of carbon-doping based on solid-state reaction on the quality needs to be further improved.