The most widely used method to address the tremendous capacity decay of silicon anodes due to their huge volume change during cycling is to reduce them into nano-scale structures. While various nanostructures have successfully alleviated the unstable volumetric change of silicon anodes, the exponentially increased surface area of these nanostructures bring out irreversible lithium consumption during the SEI formation process which leads to a large first cycle capacity loss. To solve the problem, here we come up with an idea of synthesizing carbon coated prelithiated silicon nanoparticles to serve as the anode. With the prelithiation treatment the lithium consumed in the SEI formation could be compensated, while leaving void space inside the carbon shell to allow silicon particles expand and shrink freely and thus providing stable interfaces between particles during cycles. By this design, the silicon anode will achieve a high first cycle Columbus efficiency and at the same time maintain a good mechanical stability to ensure a long cycle life. Synthesis method of the carbon coated prelithiated silicon nanoparticles will be introduced and the electrochemical performance will be discussed.