To　analyze　sublingual　vessel　by　computer,　the　authors　proposed　a　sublingual　vessel　segmentation　algorithm　based　on　fuzzy　clustering　and　tracking,　which　combines　tongue　image　segmentation　by　Snakes　model　and　prior-knowledge　on　the　sublingual　vessel　distribution.　Result　shows　that　this　method　could　achieve　good　effect,　which　builds　a　good　foundation　of　automatic　analysis　of　sublingual　vessel　by　computer.