Foot　and　ankle　deformity　is　a　common　complaint　in　orthopedic　surgery,　among　which　the　multisegment　concurrent　types　are　even　more　severe.　As　a　key　medical　device　for　multisegment　deformity　correction,　the　composite　parallel　external　fixator　(PEF)　design　has　a　profound　impact　on　the　correction　outcomes.　However,　existing　PEFs　share　a　single　configuration　and　have　inadequate　adaptation　to　various　deformity　types,　leading　to　problems,　such　as　complex　structural　composition,　excessive　adjustment　parameters,　and　uncomfortable　wearing　experience.　To　overcome　these　problems,　this　article　proposes　a　novel　correction　requirement-dominated　design　approach　for　composite　PEF.　Multisite　frame　mounting　modes　and　multitype　struts　are　introduced　to　form　required　PEF　configurations.　Lower　mobility　struts　can　constrain　the　unwanted　degrees-of-freedom,　thus　enabling　the　device　to　precisely　match　the　requirement-function　relationship.　Taking　the　double-segment　deformity　as　research　object,　clinical　cases,　and　composite　PEF　assembly　simulations　are　provided.　Experiments　are　carried　out　on　the　mechanical　prototype.　The　mounting　test　proves　the　interconverting　ability　and　deformity-targeting　property　of　the　derived　composite　PEFs.　Moreover,　the　motion　test　verifies　that　the　device　can　distract　patients　of　different　weights　to　complete　the　correction　path,　and　the　stability　test　demonstrates　that　the　device　can　resist　external　bumps,　thus　indicating　the　feasibility　of　the　approach.