Considering　the　complexity　geometry　and　thin　wall　feature,　the　semiconical　shell　workpiece　will　induce　complicated　and　intense　vibration　in　the　milling　process　leading　to　poor　surface　quality　and　large　machining　deformation.　In　order　to　suppress　the　vibration,　this　paper　focused　on　the　semiconical　shell　workpiece　and　proposed　a　multiple　distribution　tuned　mass　damper　(MDTMD)　vibration　control　technique　by　attaching　a　series　of　optimized　tuned　mass　dampers　(TMD)　to　each　optimal　position　of　workpiece.　The　vibration　characteristics　and　modal　shapes　of　workpiece　were　obtained　with　the　use　of　spectro-geometric-Ritz　method　(SGM)　and　the　dynamic　model　of　workpiece　with　MDTMD　was　established.　A　novel　design　of　TMD　was　proposed.　The　optimal　parameters　and　positions　of　each　TMD　were　determined　simultaneously　using　numerical　optimization　algorithm　based　on　the　modal　summation　method.　Theoretical　studies　and　experiment　results　shown　that　the　proposed　MDTMD　method　can　remarkably　improve　the　dynamic　stiffness　of　the　workpiece.　The　performance　of　vibration　suppression　is　further　verified　in　the　impact　tests　and　milling　experiments.