To　explore　the　behavior　description　method　of　sensor　network　system　in　ambient　intelligence　environment,　this　paper　introduced　the　basic　characteristics　of　ambient　intelligence　system,　analyzed　the　architecture　and　basic　functions　of　sensor　network　system.　Moreover,　an　implementation　scheme　of　the　sensor　network　system　is　proposed　based　on　the　study　above.　This　research　indicates　that　the　ambient　intelligence　is　a　complicated　real-time　system　with　perceptive　function　and　implicit　wireless　communication　ability,　which　centered　on　users　and　targeted　at　providing　humanized　and　intellectualized　service.　Based　on　the　behavioral　analysis　of　the　ambient　intelligence　system,　a　behavior　model　of　perception　system　is　established　in　system-level　perspective　by　using　the　system-level　modeling　language　of　POOSL,　tools　included　SHESim　as　well　as　the　modeling　method.