Gradual　correction　with　parallel　external　fixators　(PEFs)　is　a　common　treatment　strategy　for　foot-ankle　deformities.　Designing　appropriate　PEFs　and　developing　correction-assisted　software　(CAS)　with　comprehensive　functions　are　clinically　important　to　assure　a　successful　treatment　and　the　proper　recovery　of　the　patient.　However,　existing　PEFs　are　inadequately　targeted　for　specific　deformity　types　of　foot-ankle,　and　CAS　is　not　available　for　detecting　multiple　interference　phenomena,　thus,　the　safety　and　accuracy　of　the　corrective　process　cannot　be　guaranteed.　In　this　article,　an　electromechanical　drive　PEF　prototype　with　good　deformity-targeting　property　is　proposed　for　a　common　type　of　foot-ankle　deformity　with　five　corrective　degree-of-freedom.　The　system　is　supported　with　the　CAS　that　involves　digital　reconstruction　technology,　trajectory　planning　technology,　and　safety　inspection　technology.　In　safety　inspection　technology,　collision　inspection　is　carried　out　based　on　the　oriented　bounding　box　method,　and　inspection　of　the　distraction　rod　overstroke　and　of　the　singularity　are　realized　based　on　the　kinematic　model.　In　this　way,　an　interference-free　correction　scheme　can　be　generated　and　executed　using　the　proposed　PEF　system.　Case　simulation　demonstrates　the　feasibility　of　correction-assisted　technologies,　the　applicability　of　the　prototype,　and　the　postural　synergy　between　the　virtual　model　and　substantiation.