A　3-D　model　of　large　size　of　hydrostatic　support　was　established　in　this　paper　in　order　to　investigate　the　influence　of　temperature-viscosity　and　pressure-viscosity　characteristics　on　the　work　performance　of　oil　film　in　the　hydrostatic　support　system.　The　effect　of　oil＇s　capacity,　temperature　and　viscosity　were　studied　in　the　simulation　by　making　use　of　the　Finite　Volume　Method.　It　is　indicated　from　the　results　that　the　temperature-viscosity　and　pressure-viscosity　characteristics　obviously　affect　the　carrying　capacity　of　the　oil　chamber　and　the　temperature　rise.　Results　of　the　computational　model　considering　the　temperature-viscosity　and　pressure-viscosity　characteristics　in　this　paper　have　good　agreement　with　that　in　actual　operating　conditions　and　also　have　guiding　significance　to　select　lubricant　in　the　hydrostatic　support　system.