Foot-Ankle　deformity　is　one　of　the　common　complaints　in　orthopaedic　surgery.　The　external　fixator　has　been　selected　as　the　medical　apparatus　to　help　with　gradual　correction,　and　the　configuration　may　affect　the　final　correction　results.　It　is　meaningful　to　design　novel　parallel　external　fixator　with　deformity-Targeting　property.　Taking　the　main　foot-Ankle　deformities　with　four　corrective　degree-of-freedom　(c-DOF)　as　research　object,　a　4-DOF　parallel　configuration　is　proposed　in　this　paper.　Considering　several　applicable　conditions,　lower-mobility　kinematic　struts　are　selected　to　provide　desired　constraints.　Then,　inverse　kinematic　model　and　Jacobian　matrix　are　derived.　Finally,　after　the　structural　design,　clinical　case　is　simulated　to　prove　the　applicability　of　the　parallel　external　fixator.　©　2022　IEEE.