Linear　Rolling　Guide　not　only　bears　normal　load,　but　also　tangential　load　when　it　is　used　actually.　On　the　basis　of　Hertz　Contact　Theory,　this　essay　firstly　analyses　the　situation　that　the　LR　Guide　bears　tangential　light　load　with　four　lines　of　balls.　When　the　external　load　further　increases,　the　essay　analyses　the　situation　that　the　guide　bears　heavy　load　with　only　two　lines　of　balls,　and　perfects　the　tangential　static　stiffness　model　of　the　LR　Guide.　On　the　basis　of　it,　aiming　at　the　deficiency　that　the　previous　model　just　considered　the　balls’　elastic　deformation,　the　essay　put　out　a　tangential　static　stiffness　model　of　the　LR　Guide　which　considered　the　deformation　of　the　rail,　and　the　validity　of　the　model　is　verified　by　experiment.　At　last,　the　essay　studies　the　influences　of　preload　and　groove　fitness　on　the　tangential　stiffness　of　LR　Guide,　providing　the　basis　of　choosing　parameters　when　chooses　LR　Guide.　©　2014,　Journal　of　Chemical　and　Pharmaceutical　Research.　All　rights　reserved.