Existing　methods　can＇t　get　the　evidence　timely,　don＇t　protect　attestator＇s　privacy　enough,　and　have　own　security　problems,　to　solve　these　problems,　a　dynamical　attestation　of　trust　based　on　secure　virtual　machine　introspection　was　provided.　First,　using　the　deterministic　push　down　automata　(DPDA)　to　establish　the　expected　behavior　model　of　the　program,　and　then,　in　order　to　determine　trustworthiness　of　the　program,　through　the　virtual　machine　introspection　technique　(VMI),　the　actual　behavior　was　checked　dynamically.　In　addition,　using　VMI　to　analysis　the　memory　state　of　attes-tator,　and　reconstructing　the　key　data　structure,　and　verifying　integrity　of　the　system　kernel　files　and　the　critical　data.　Finally,　trustworthiness　attestation　system　was　designed　and　implemented.　The　experiments　show　that　the　system　satisfies　the　requirements.