Abstract: In order to improve the electrochemical performance of LiMn_0.7Fe_0.3PO₄ (LMFP), the graphene oxide (GO)/LMFP composites were synthesized using solvothermal method by compound of GO and LMFP firstly. Then, structure and elements of the samples obtained were analyzed by XRD and inductively coupled plasma (ICP), the morphologies of samples were characterized by SEM, and the tests for electrochemical performances were conducted by program-controlled battery test system and electrochemical workstation. The results show that the GO/LMFP composites obtained are uniphase olivine structure, the particle size is about 200 nm and the distribution is relatively uniform. The initial discharge specific capacities of composite after the modification of GO were 157.9, 148.1, 142.0, 122.3, 87.3 mAh·g^-1 at rates of 0.2C, 0.5C, 1.0C, 5.0C and 10.0C respectively, which increases 5.9%, 4.7%, 7.0%, 24.3% and 66.6% respectively compared with C/LMFP composite. The conclusions obtained show that the adding of GO improves the electronic conductivity and electrochemical activity of the material effectively, and synergistically effects on amorphous carbon, the effective utilization rate of active material increases, and the cycle stability of GO/LMFP composite improve.