Warheads　full-scale　fragment　field　has　great　significance　to　military　production　and　storage　safety.　In　this　paper,　an　improved　Continuum-Discontinuum　Element　Method　(CDEM)　will　be　used　for　the　first　time　to　solve　the　problems　of　large　deformation　and　cross-scale　calculations　for　warheads,　describing　the　complete　process　from　casing　breakage　to　fragment　scattering　and　landing.　A　fragment　equivalent　layer-detonation　product　escape　algorithm　is　further　introduced　to　increase　calculation　efficiency,　and　the　fragmentation　field　is　post-processed　using　a　penetrable　virtual　target　board　algorithm.　This　method　simulates　warhead　fragmentation　in　the　full　space-time　domain,　laying　a　foundation　for　subsequent　study　of　questions　like　warhead　fragmentation　safety　distance　and　fuze　delay　arming　time.　Comparison　with　warhead　static　explosion　and　ballistic　gun　testing　data　verify　the　effectiveness　of　this　method.