The　cylinder　is　prone　to　be　damaged　due　to　temperature　increasing　in　vibration　control　and　durability　testing　process　of　viscous　damper.　In　order　to　avoid　the　overheating　generated　by　long　working　hours,　which　resulting　in　a　viscous　liquid　water　evaporation　and　leading　to　a　abrupt　increase　in　internal　pressure　inside　the　cylinder,　the　CFD　software　Fluent　was　used　to　simulate　the　durability　test　process　of　the　oil　film,　where　the　heat　was　easy　to　generate　and　suggestion　for　improving　the　viscous　damper　was　proposed.