Cloud　computing　is　a　hot　topic　with　the　virtual　technology　as　the　key　one　for　the　cloud.　This　paper　focuses　on　virtual　machine　migration　in　the　cloud　computing　environment.　According　to　a　comprehensive　requirements　analysis,　we　provide　a　trusted　dynamic　self-confidence　migration　(TDAM)　algorithm　which　is　based　on　the　load　of　physical　and　virtual　machine　CPU,　memory,　I　/O.　Migration　weights　calculated　as　MQ,　using　MQ　as　a　metric　to　automatic　select　the　virtual　machines　would　be　migrated,　and　in　the　process　of　migration　the　source　and　destination　should　take　trusted　attention.　Then,　based　on　Xen　technology　in　the　Linux　system,　the　prototype　of　TDAM　System　can　be　achieved.　Experimental　results　show　that　the　algorithm　can　improve　the　availability　and　reliability　of　cloud　services　as　well　as　achieve　energy　saving　purposes.