This　paper　investigates　the　geometric　characteristics　of　the　sun-worm　and　the　stationary　internal　toroidal　gear　in　toroidal　drive,　explores　the　three　dimensional　modeling,　carries　out　kinematical　simulation　and　interference　detection　for　this　kind　of　drive.　Further,　the　dynamical　simulation　is　also　developed.　Finally,　the　NC　manufacturing　simulation　is　propose　that　solves　cutter　selection　and　undercutting　elimination　for　the　practical　NC　manufacturing　of　the　stationary　internal　toroidal　gear.　©　2007　IEEE.