An　interference　detection　method　was　put　forward　to　effectively　solve　the　problems　of　machining　local　and　global　interference　phenomenons　on　stationary　internal　toroidal　gear　tooth　surfaces.　The　introduction　to　interference　detection　plan　clusters　and　the　structure　of　interference　detection　line　clusters　were　to　obtain　stationary　internal　toroidal　gear　tooth　surface　and　tool　scanning　body　discretization　model.　By　using　stationary　internal　toroidal　gear　tooth　surface　and　tool　scanning　body　discretization　model,　and　through　solving　the　cutting　plane　tool　centers,　stationary　internal　toroidal　gear　tooth　surface　machining　local　and　global　interference　areas　were　determined.　And　through　the　example　analyses,　the　feasibility　of　machining　interference　detection　method　of　stationary　internal　toroidal　gear　tooth　surface　was　further　verified.　©　2017,　China　Mechanical　Engineering　Magazine　Office.　All　right　reserved.