Silver-coated　aluminum　powder　was　gained　by　electroless　plating.　The　principle　of　electroless　silver　plating　on　aluminium　powder　was　studied　and　the　influences　of　ammonia,　argentamine,　stabilizing　agent,　temperature　and　pH　value　on　electroless　silver　plating　was　investigated.　The　results　show　that　ammonia　can　strength　stability　of　plating　bath　and　improve　the　micrographics　of　immersion　silver　coating,　argentamine　concentration　has　great　influences　on　the　resistivity　and　content　of　silver,　little　stabilizing　agent　can　improve　stability　of　plating　bath　while　more　stabilizing　agent　leads　to　loose　silver　coating　layer,　the　temperature　and　pH　value　can　increase　the　amount　of　deposited　silver　but　bring　about　decomposition　of　plating　bath.