To　design　the　two-tooth　difference　pushrod　movable　tooth　transmission,　the　tooth　profile　equations　of　the　components　in　mesh　pair　are　derived.　The　effects　of　parameters,　such　as　the　transmission　ratio,　half-axis　size　of　cam＇s　theoretic　profile　and　the　length　and　radius　of　the　movable　tooth,　on　the　properties　of　tooth　profile　are　analyzed.　Meanwhile,　the　parameter　design　condition　is　advanced　according　to　the　desire　of　no　interference　appearance　on　inner　gear＇s　tooth　profile.　By　means　of　the　transmission　principle　and　structural　characteristic　analysis　of　the　movable-tooth-frame,　the　calculation　formula　and　selecting　conditions　of　movable-tooth-frame＇s　parameters　for　avoiding　the　interference　of　moving　parts　and　meeting　the　transmission　continuity　are　obtained.　On　the　basis　of　above　analysis,　the　steps　for　parameter　design　of　the　two-tooth　difference　pushrod　movable　tooth　transmission　are　concluded,　and　a　design　example　is　given.　The　example　shows　that　the　geometrical　design　of　the　transmission　device　can　be　conveniently　completed　obtained　through　the　presented　design　steps.