Based　on　the　proper　generalized　decomposition　(PGD)　method,　a　calculation　model　with　Reynolds　boundary　conditions　for　solving　nonlinear　oil　film　forces　of　finite　length　journal　sliding　bearing　is　established　and　the　detailed　solving　process　and　method　are　proposed.　The　results　show　that　compared　with　the　FDM,　the　calculation　speed　can　be　increased　by　4　times,　and　the　relative　error　is　controlled　within　1%,　which　proves　the　accuracy　and　efficiency　of　the　model.　The　dynamic　analysis　of　lubricated　clearance　joints　depends　on　the　solution　of　Reynolds　equation　and　the　accuracy　and　efficiency　can＇t　be　satisfied　simultaneously.　The　developed　calculation　model　is　applied　to　a　multibody　system　with　lubricated　clearance　joints　and　the　results　show　that　the　new　model　can　save　6　minutes　and　20　minutes,　respectively,　in　a　single　operation　cycle　under　the　grid　density　of　30×30　and　40×40　compared　with　the　FDM,　which　proves　the　model＇s　feasibility　and　engineering　application　value.　©　2021,　Editorial　Office　of　Journal　of　Xi＇an　Jiaotong　University.　All　right　reserved.