Featured　Application　The　developed　electromotor-driven　parallel　external　fixator　can　be　automatically　adjusted　according　to　the　adjustment　strategy　to　reduce　the　involvement　of　the　patient　and　can　also　be　used　as　a　teaching　tool　of　medical　training　for　clinicians　to　learn　deformity　correction　techniques.　External　fixators　are　widely　used　in　deformity　correction　based　on　distraction　osteogenesis.　Traditionally,　the　rods　are　manually　operated　by　patients　several　times　a　day,　which　will　ensure　the　patient＇s　compliance,　accumulative　adjustment　error,　and　trajectory　deviation.　To　reduce　the　patients＇　compliance　and　the　complexity　of　adjustment,　an　electromotor-driven　parallel　external　fixator　is　developed　to　gradually　correct　the　deformity,　which　allows　the　fixator　to　be　automatically　adjusted　and　can　correct　any　three-dimensional　deformity　with　continuous　stability.　Two　adjustment　strategies　are　proposed　through　different　trajectory　control　methods　based　on　the　inverse　kinematics　solution,　and　the　trajectory　and　bone　shape　are　generated　to　investigate　the　characteristics　of　the　new　bone　more　intuitively.　The　range　of　motion　is　performed　utilizing　the　numerical　searching　method　to　assess　the　fixator＇s　correction　capability.　Finally,　the　trajectory　verification　experiment　is　carried　out　using　the　artificial　bone　model　to　perform　the　two　adjustment　strategies.　The　results　show　that　the　developed　external　fixator　has　high　correction　accuracy　with　0.0172　mm,　and　can　accurately　and　safely　realize　the　preset　correction　trajectory.　The　developed　fixator　system　can　also　be　used　as　a　teaching　tool　for　medical　training　for　clinicians　to　learn　deformity　correction　technology.