The　vertical　ammunition　cabin　possesses　the　functions　of　ammunition　storage,　recognition　and　automatic　selection.　The　ammunition　vertically　placed　in　the　cabin　is　circularly　dragged　along　the　optimum　ammunition　trajectory　by　the　drive　chain.　In　order　to　analyze　the　dynamic　properties　of　drive　chain　and　the　stability　of　ammunition,　all　links　of　drive　chain　and　the　double-row　rollers　of　ammunition　rack　are　simplified　as　spring-damper　elements.　The　full　dynamics　models　of　drive　chain　and　the　stability　model　of　ammunition　are　established　by　use　of　multi-body　dynamics　and　kineto-elastodynamics　methods.　A　numerical　simulation　of　the　full　dynamics　models　is　performed　by　adopting　Matlab　software.　The　stability　model　of　ammunition　is　solved.　Simulated　results　show　that　the　velocity　and　acceleration　of　drive　chain　fluctuate　within　a　small　range.　The　dynamic　response　and　drastic　characteristic　of　centrifugal　forces　are　dominated　by　the　shape　feature　of　the　trajectory.　The　normal　stability　of　ammunition　is　influenced　by　the　drastic　characteristic.　The　tangential　stability　is　determined　by　the　inertia　forces　of　ammunition　and　the　dynamic　parameters　of　drive　chain.　The　analysis　shows　that　the　ammunition　has　high　normal　and　tangential　stability.　The　tangential　accelerations　of　chain　and　the　normal　accelerations　of　ammunition　rack　are　measured.　It　can　be　found　that　the　measured　data　are　consistent　with　the　simulated　results.　©　2017,　Editorial　Board　of　Acta　Armamentarii.　All　right　reserved.