BACKGROUND:　The　objective　of　this　study　was　to　investigate　how　treatment　strategies　in　the　same　treatment　affected　the　canine＇s　initial　displacement　and　the　stress　in　periodontal　ligament　using　three-dimensional　finite　element　analysis.　And　to　find　out　the　way　to　design　an　effective　treatment　plan.　METHODS:　Based　on　computed　tomography　images　of　the　teeth　and　their　supporting　tissues,　solid　models　were　used　to　build　finite　element　models.　Three　treatment　plans　of　three　different　transparent　tooth　correction　therapies　finite　element-analyses　were　operated.　RESULTS:　The　canine＇s　initial　displacement　and　stresses＇　distribution　in　periodontal　ligament　were　obtained.　CONCLUSIONS:　For　rotation　movement,　the　canine　should　rotate　along　tooth　long　axis,　and　not　combine　with　other　kinds　of　tooth　movement　as　possible.　For　translation　movement,　the　combination　of　translation　and　inclination　movement　is　helpful　for　the　treatment.