Nowadays, most of countries in the world promote energy saving and carbon emission reduction. The development of electric vehicles (EVs) is one of the main solution to reduce the carbon emission. Lithium ion batteries (LIBs) have higher energy density than other secondary batteries so they serve as the most popular energy storage device for EVs. However, the capacity of commercial graphite anode material is limited to ~372 mA h g-1 which is hard to meet the high-energy demand for long-range EVs. Silicon with highest theoretical capacity of 4200 mA h g-1 has been considered as the next-generation anode material. Despite the high capacity, the severe volume change of silicon during charge and discharge processes leads to the peeling-off of the active materials from the current collector. Therefore, the capacity retention of Si is poor. Porous structure and carbon coating are two major methods applying for improving the capacity retention of Si.In our work, we utilized Si-Al alloys as precursors to synthesize micro-size porous Si anode materials by acidic treatment. Besides, carbon was coated on the porous Si particles to increase the electronic conductivity. Si-Al alloys are commercial available so this micro-size porous Si/C anode material can be mass-produced. High capacity around 1000 mA h g-1 could be achieved with good capacity retention. It indicates that the micro-sized porous Si/C is a promising LIB anode materials for electric vehicle application.