The　problems　of　parameter　selection　and　geometrical　design　of　the　movable　rolling　tooth　transmission　with　cam　actuating　are　studied.　The　comprehensive　influence　of　tooth　profile　parameters,　such　as　transmission　ratio,　theoretic　cam　half-axis　length,　and　radius　of　movable　rolling　tooth,　on　tooth　profile　property　of　the　inner　gear　is　analyzed,　and　the　value　selection　relationship　among　tooth　profile　parameters　is　established　under　the　condition　of　no　interference　appearance　on　inner　gear＇　profile.　According　to　the　transmission　principle　and　structural　characteristics　analysis　of　the　movable-tooth-frame,　the　calculation　formulae　and　selection　conditions　of　the　geometrical　parameters　of　movable-tooth-frame　for　avoiding　parts　movement　interference　and　meeting　the　assembly　requirement　and　transmission　continuity　are　proposed.　On　the　basis　of　the　above　analysis,　the　steps　for　geometrical　parameter　design　of　the　movable　rolling　tooth　transmission　with　cam　actuating　are　presented,　and　the　geometrical　design　process　of　this　kind　of　transmission　equipment　is　illustrated　by　means　of　an　example.　It＇s　shown　that　the　design　course　of　the　movable　rolling　tooth　transmission　with　cam　actuating　can　be　simplified,　and　satisfied　parameter　combination　can　be　obtained　on　the　basis　of　the　value　selection　relationship　of　tooth　profile　parameters,　the　selection　conditions　of　movable-tooth-frame　parameters　as　well　as　the　parameter　design　steps　presented.　©　2011　Journal　of　Mechanical　Engineering.