Fracture　correction　is　important　orthopedics　operation　and　can　be　performed　by　unilateral　external　fixator.　Due　to　pin　deviations　being　inevitable　during　the　operation,　searching　the　impacts　of　pin　deviation　on　the　fracture　correction　and　fixator　joint　adjustment　are　important.　This　study　puts　forward　evaluation　index　with　sensitivity　analysis　for　investigating　the　impact　of　three　orientation　deviations　and　three　position　deviations　on　fracture　correction.　Meanwhile,　based　on　a　clinical　case　from　a　28-year-old　female,　the　influence　of　pin　deviation　on　the　adjustment　of　fixator　joints　was　analyzed　by　inverse　kinematic　method.　Different　pin　deviations　have　different　sensitivity;　the　sensitivity　of　orientation　deviation　is　relatively　larger　than　position　deviation.　The　existence　of　pin　deviation　will　result　in　the　change　of　the　adjustment　value　of　fixator　joints.　In　addition,　the　experiments　of　seven　situations　were　established　to　verify　the　analytical　results.　This　study　revealed　the　sensitivity　of　different　pin　deviations　which　can　also　be　used　to　predict　the　adjustment　value　of　fixator　joints　and　the　accuracy　of　fracture　correction.　This　research　also　helps　to　reduce　operation　time　and　decrease　damage　to　soft　tissue　by　reducing　the　frequency　of　inserting　pins.