Nano FePO4.xH2O powders were synthesized by controlled crystallization method,using Fe(Ⅲ) compound as the iron source.The nano FePO4.xH2O powders were pretreated at 500℃ for 4 h in air to obtain nano FePO4 pre-cursor.Then the olivine nano LiFePO4/C composites were obtained through carbonthermal reduction process at dif-ferent temperatures.The structure,morphology,physicochemical properties and electrochemical properties of the nano FePO4.xH2O powder,FePO4 precursor and LiFePO4/C composites synthesized at di...