Abstract: In this paper，the superior performance and defects of LiFePO4 were investigated with the emphasis on crystal structure. The features and effects of two techniques for modification：physical and bulk doping were presented. The research progress of the preparation of LiFePO4 was introduced，such as solid state method，co-precipitation and so on. Finally，the development prospects of LiFePO4 and its research direction leading to the practical application in Li-ion battery industry were discussed.