Background　Fracture　correction　is　an　important　orthopedic　operation,　which　can　be　performed　using　a　unilateral　external　fixator.　Regulating　the　rotational　and　translational　joints　of　the　fixator　is　usually　necessary　to　correct　complex　deformities.　However,　pin　deviations　inevitably　occur　during　surgery,　and　the　fixator　has　its　own　limitations.　Therefore,　the　relationship　between　fixator　joint　adjustment　and　pin　deviations　must　be　identified　and　discussed.　Methods:　The　influence　of　pin　deviation　on　the　fixator　joint　adjustment　was　analyzed　using　the　inverse　kinematics　method　based　on　a　6-DOF　unilateral　external　fixator.　The　effect　of　multiple　pin　deviations　on　fixator　joint　was　also　discussed.　Findings:　This　study　reveals　that　the　single　pin　deviations　in　different　axes　affect　different　fixator　joints.　When　multiple　deviations　occur　simultaneously,　the　regulated　quantity　is　equal　to　the　sum　of　that　of　each　deviation.　Interpretation:　Reasonable　pin　placement　can　reduce　the　joint　adjustment　values　and　prevent　reaching　limit　values　of　fixator　joint,　which　aids　in　expanding　the　application　scope　of　the　fixator.　This　research　can　also　help　reduce　the　duration　of　orthopedic　surgeries,　if　the　relationship　between　pin　deviation　and　joint　adjustment　is　known　in　advance.