Pentaerythritol　tetra　(2-ethylhexanoate)　(PETE)　has　been　used　as　an　environmentally　friendly　lubricant.　Molecular　dynamics　(MD)　simulations　based　on　polymer　consistent　force　field　(PCFF)　are　adopted　to　investigate　the　molecule　and　density　distributions　of　lubricant　PETE　in　nanogap　at　two　different　temperatures,　three　different　initial　film　thicknesses　and　a　wide　range　of　pressures.　Results　show　that　the　densities　of　MD　simulations　are　accurate　to　the　values　of　Tait　equation　with　the　maximum　initial　film　thickness　(9.17nm),　the　deviations　are　less　than　5%.　The　film　thickness　and　compressibility　of　films　decrease　with　increasing　pressure　on　the　wall,　but　the　compressibility　is　similar　for　films　with　different　initial　film　thicknesses.　Because　the　PETE　molecule　consists　of　four　long　branched　chains,　different　spatial　scales　are　in　the　same　magnitude,　the　phenomenon　of　fluid　atoms　tending　to　form　layers　parallel　to　confining　walls　has　not　been　observed　except　for　the　regions　of　lubricant　adjacent　walls.　Distinct　excluded　volumes　have　not　been　found　at　the　liquid/wall　interfaces.　©,　2015,　Journal　of　Mechanical　Engineering.