We　investigate　the　generation　of　continuous-variable　(CV)　entanglement　of　two　separated　atomic　ensembles　in　coupled　cavities.　We　find　that　under　certain　conditions,　the　entanglement　between　the　two　ensembles　is　gained　periodically　when　the　three-level　Λ-type　atoms　in　each　ensemble　dispersively　interact　with　one　classical　field　and　one　cavity　mode.　Generation　of　the　entangled　state　does　not　completely　depend　on　the　cavity　photon　number.　In　addition,　the　effect　of　decoherence　can　be　suppressed　effectively.　©　2011　American　Physical　Society.