Nanoscale　p-Si@Cu(x)(x　stands　for　the　cladding　amount　of　copper)　was　prepared　by　St　ber　method　and　magnesiothermic　reduction　method.　The　morphologies　and　structures　of　p-Si@Cu(x)　alloy　were　characterized　by　X-ray　diffraction(XRD),　scanning　electron　microscopy(SEM)?transmission　electron　microscopy(TEM)　and　specific　surface　area　analysis,　and　the　cyclic　performance　and　rate　performace　of　the　material　were　investigated.　The　results　show　that　the　first　discharge　and　charge　capacity　of　p-Si@Cu(0.05)　are　3596.9　and　2590.7　mAh/g,　respectively　at　100　mA/g　and　the　first　coulomb　efficiency　is　72.03%;　its　cell　cycle　stability　and　rate　performance　of　p-Si@Cu(0.05)　are　also　the　best,　the　reversible　capacity　is　1004.9　mA5h/g　at　1C.　The　reversible　capacity　is　1706.5　mA5h/g　at　0.1C　after　100　times　cycling　and　the　capacity　remaining　rate　is　76.1%.