The　characteristics　of　the　constant　flow　and　closed　type　hydrostatic　rotary　table　of　heavy　duty　CNC　machine　tools　and　the　coupling　effect　between　the　worktable＇s　structural　deformation　and　the　supporting　force　of　oil　pads　were　studied,　and　then,　according　to　the　hydrostatic　theory,　the　nonlinear　spring　element　was　designed　to　replace　the　hydrostatic　oil　film,　and　a　finite　element　model　for　the　hydrostatic　rotary　table　was　established.　Based　on　the　model,　the　supporting　force　computation　and　the　supporting　force　analysis　for　the　oil　pads　were　performed.　The　limit　loads　of　supporting　points　were　achieved　at　the　radius　direction　according　to　the　allowed　maximum　pocket　pressure.　The　research　can　provide　the　theory　basis　for　supporting　point　distribution　of　heavy　work　pieces.