Aiming　at　the　problems　of　inefficiency　and　inaccuracy　in　the　evaluation　of　fir　tree　blade　root　profile,　a　method　of　computer　aided　profile　evaluation　based　on　particle　swarm　algorithm　is　proposed.　The　evaluation　process　is　automated　by　this　method,　the　theoretical　profile　and　the　coordinates　of　the　measured　points　are　read　automatically,　the　measured　points　and　the　theoretical　profile　are　aligned　automatically,　the　profile　deviation　is　calculated,　and　whether　the　blade　root　is　qualified　is　determined.　The　mathematical　model　and　calculation　method　of　profile　evaluation　are　given,　the　measured　points　and　theoretical　profile　are　aligned　precisely　according　to　the　principle　of　least　square　by　making　use　of　the　particle　swarm　optimization　algorithm　with　adaptive　inertia　weight(APSO)　after　coarse　alignment,　and　the　influence　of　position　error　between　design　reference　and　measurement　reference　on　the　results　of　profile　evaluation　is　eliminated.　Simulation　experiment　and　practical　application　manifest　better　accuracy　and　stability　can　be　obtained　by　using　APSO　algorithm　compared　with　other　algorithms　when　evaluating　the　fir　tree　blade　root　profile.　The　computer　aided　profile　evaluation　method　proposed　in　this　paper　could　totally　replace　the　traditional　manual　method.　©　2019　IOP　Publishing　Ltd.　All　rights　reserved.