The　flexible　insulation　was　prepared　by　adding　Zn　(MAA)2or　Mg　(MAA)2into　the　blended　EPDM/NBR.　The　effect　of　the　content　of　Zn　(MAA)2and　Mg　(MAA)2on　the　bonding　property　between　45#steel　and　insulation　was　investigated　respectively.　The　results　show　that　a　small　amount　of　Zn　(MAA)2or　Mg　(MAA)2in　the　blended　EPDM/NBR　both　can　improve　obviously　the　bonding　strength　between　45#steel　and　insulation　without　using　any　other　adhesive.　With　the　increase　of　the　contents　of　Zn　(MAA)2,　the　bonding　strength　increases　firstly,　but　then　sharply　decreases　after　2　phr.　The　destruction　of　all　the　samples　added　with　Zn　(MAA)2occurs　on　the　bonding　surface　when　pulled　off.　However,　when　Mg　(MAA)2is　added　instead　of　Zn　(MAA)2,　the　bonding　strength　between　45#steel　and　insulation　increases　continuously　with　the　increasing　the　contents　of　Mg　(MAA)2,　and　it　is　higher　than　that　of　insulation　with　in　the　same　content　Zn　(MAA)2.　And　all　the　samples　destructive　modes　happen　within　the　insulation.　The　bonding　strength　of　all　the　samples　are　all　above　4.58　MPa　containing　2-7　phr　Mg　(MAA)2.