Ambient　intelligence　(AmI)　environment　is　a　complicated　real-time　system　with　perceptive　function　and　implicit　wireless　communication　ability,　which　provides　humanized　and　intellectualized　service.　The　previous　study　of　AmI　characteristics　and　intelligent　sensor　network　system　architecture　makes　it　feasible　to　establish　a　system-level　behavioral　model　of　sensor　network　system　in　AmI　environment.　By　using　POOSL　modeling　language　under　the　SHESim　development　environment,　a　further　description　class　model　of　system　behavior　was　put　forward　in　this　study.　Moreover,　it　proposed　a　model　design　sketch　of　various　processing　classes　and　explained　the　clusters　described　in　the　top　behavioral　model　in　detail,　which　lays　excellent　foundation　for　establishing　performance　analysis　model　in　the　future　intelligent　sensor　network　systems.