The　structural　stability　and　theoretical　strength　of　FCC　crystal　Ag　under　uniaxial　loading　have　been　investigated　by　combining　MAEAM　with　Wang　modified　Born　stability　criteria.　The　results　reveal　that,　under　sufficient　compression,　there　exists　a　stress-free　BCC　phase,　which　is　unstable　and　slips　spontaneously　to　a　stress-free　mBCT　phase　by　consuming　internal　energy.　The　stable　region　ranges　from　-2.076　to　4.390　GPa　in　the　theoretical　strength　or　from　-7.972%　to　8.721%　in　the　strain　correspondingly.　The　calculated　structural　energy　difference　between　the　BCC　and　FCC　phase　is　in　good　agreement　with　the　experimental　value.　(C)　2011　Elsevier　B.V.　All　rights　reserved.