The　influence　of　the　misalignment　caused　by　a　crankshaft　deformation　on　the　trajectory　of　the　journal　bearing　center　was　studied.　By　the　relationship　between　the　misalignment　angle　of　the　crankshaft　and　the　force　applied　on　the　crankshaft,　the　misalignment　angle　was　considered　in　the　computation　of　the　trajectory　of　the　journal　bearing　center.　The　calculation　shows　that　the　deformation　of　the　crankshaft　can　cause　the　trajectory　divergence　of　the　journal　bearing　center.　Meanwhile,　the　trajectory　is　much　divergent　with　the　increase　in　foreign　vertical　force.　This　shows　that　the　deformation　of　a　crankshaft　should　be　considered　in　the　analysis　of　the　trajectory　of　a　journal　bearing　center.