Aim:　To　design　and　assemble　a　kind　of　extension　apparatus　for　stain-testing　during　mandible　distraction　osteogenesis,　and　establish　an　animal　model　with　simply-operated　strain-testing　during　mandible　distraction　osteogenesis.　Methods:　The　extension　apparatus　for　strain-testing　during　mandible　distraction　osteogenesis　was　self-designed　and　assembled,　and　the　osteotomy　was　completed　on　the　same　position　of　12　rabbits　at　the　junction　of　mandibular　angle　and　body.　The　jaw　extension　apparatus　adhered　with　strain　gauge　was　used　to　tract　mandibles　of　rabbits.　The　encapsulation　materials　of　urethanes　and　silastics　were　compared　to　find　suitable　encapsulation　materials.　The　osteogenesis　was　observed　after　distraction　with　general　and　X-ray　observation.　Results:　Distraction　osteogenesis　was　carried　out　successfully　on　all　the　rabbits.　The　rabbits　with　silastics　as　the　encapsulation　material　could　transfer　the　strain　signals　successfully,　while　those　with　urethanes　as　the　encapsulation　material　could　not　do　it　well.　Conclusion:　The　rabbit　with　silastics　as　the　encapsulation　material　is　an　ideal　animal　model　with　strain-testing　during　mandible　distraction　osteogenesis.