Introduction:　Unilateral　external　fixators　are　widely　used　in　orthopedics　to　stabilize　fractured　bones　and　to　treat　limb　deformities.　One　of　the　main　problems　is　that　it　is　difficult　to　detect　healing　status.　In　addition,　whether　load　transfer　progress　between　the　fixator　and　bone　model　are　the　same　under　axial,　torsional,　and　bending　loads　has　not　been　studied.　Methods:　Therefore　the　main　purpose　of　this　study　was　to　detect　the　load　transfer　process　between　the　fixator　and　a　bone　model　by　measuring　strains　on　the　fixator-bone　system　during　four　healing　states　using　experimental　and　finite　element　methods.　In　the　experimental　method,　20　strain　gauges　were　used　to　measure　strain　on　the　fixator　and　bone　model　under　three　load　conditions.　Polyacetal　slice　models　with　different　material　properties　were　used　to　simulate　the　callus　model　during　four　growth　states.　Results:　The　results　indicate　that　strain　on　the　bone　model　increased　and　strain　on　the　fixator　parts　decreased　with　maturation　of　the　callus　under　axial,　bending,　and　torsional　loads.　Although　all　curves　showed　a　similar　changing　trend,　they　were　slightly　different　under　the　three　loads.　Discussion　and　conclusions:　This　study　provides　a　useful　method　to　monitor　the　fracture　healing　process,　and　identifies　the　healing　endpoint,　detects　healing　status,　and　provides　useful　information　for　the　orthopedist.