Preoperative　correction　path　planning　is　an　important　preparation　for　obtaining　the　desired　correction.　However,　a　convenient　and　effective　model　has　not　been　proposed　to　characterize　the　correction　path　features,　especially　how　to　visualize　the　growth　process　of　the　bone　cross-section　has　not　been　investigated.　In　this　paper,　a　new　characterization　approach　of　the　correction　path　features　and　corresponding　evaluation　indexes　are　proposed　for　the　tibia　deformity　correction.　We　represent　the　growth　process　of　new　bone　cross-section　by　a　series　of　continuous　and　discrete　circles.　Based　on　the　definition　and　assumptions　of　the　bone　cross-section,　three　evaluation　indexes　are　proposed　to　assist　the　clinician　in　critically　comparing　and　analyzing　the　feasibility　of　preoperatively　correction　approaches.　A　motor-driven　parallel　external　fixator　(MD-PEF)　is　developed　to　verify　the　proposed　characterization　approach.　Finally,　the　features　of　the　generated　correction　paths　are　compared　and　analyzed　based　on　three　correction　methods.　The　results　show　that　the　proposed　method　can　well　present　the　growth　process　of　bone　cross-section　and　can　detect　the　overlap　phenomenon　between　bone　cross-sections.　And　the　approach　of　joint　adjustment　for　equal　bone　distraction　can　generate　a　smooth　correction　path,　uniform　distraction　rate　and　effectively　avoid　the　overlap　of　bone　cross-sections.　This　study　is　an　important　addition　to　facilitating　the　development　of　deformity　correction　techniques.