Abstract: In order to modify the electrochemical properties of Si anode for lithium ion batteries, a series of porous Si/Si-Fe alloy composites with different amounts of Fe doping were prepared by magnesium reduction process. The morphology and microstructure of the as-prepared composites were investigated. The electrochemical performance of the composites as anode materials for lithium-ion batteries were evaluated by galvanostatical charge-discharge testing.The composites show a porous structure with the uniform distribution of Si-Fe alloy inside the pores and possess remarkable cycle stability with a capacity of 1133.5mA·h/g at 0.1C after 100 cycles, a capacity retention ratio of 66% and a reversible capacity of 776.9mA·h/g at 1C.