The　drive　principle　and　structural　characteristics　of　the　movable　rolling　tooth　transmission　with　cam　actuating　are　introduced,　the　theoretical　and　working　teeth　profile　equations　of　central　inner　gear　are　deduced.　Based　on　the　hypothesis　of　stretch　small　distortion　and　distortion　congruity,　the　model　and　algorithm　of　meshing　force　analysis　under　theoretical　conditions　are　proposed,　the　presented　method　is　illustrated　through　an　example　of　meshing　force　calculation,　and　the　distributing　characteristic　of　meshing　forces　of　this　type　of　transmission　device　is　preliminarily　acquired.　The　acquired　result　of　meshing　force　analysis　can　be　adopted　as　the　analytical　base　for　structure　design,　efficiency　and　stiffness　estimation,　as　well　as　intension　checkout　of　the　movable　rolling　tooth　transmission　with　cam　actuating.