Doped Ti4 -LiFePO4/C was synthesized by a step hydrothermal method at different temperatures using (NH4)2FeSO4、LiOH、Ti(SO4)2 and H3PO4 as raw material and then modified with carbon coating. X-ray diffraction patterns and scanning microscopy images along with energy dispersive spectroscopy mappings have verified the com electron homogeneous existence of coated carbon and doped Ti4 in LiFePO4 particles with phospho-olivine structure and an average size of 140 nm at 160℃. The electrochemical performances of the material have been studied galvanostatic charge-discharge measurements and electrochemical impedance spectroscopy. The results show the material is the best electrochemical performance at 160℃. The initials discharge capacity of 160.97mAh g?1 at 0.1C, a capacity retention of 95.28% after 50 cycles at 0.5C and a increased lithium ion diffusion coefficient of 1.78?0-12 cm2 s-1.