The　conception　of　ambient　intelligence　(AmI)　was　introduced　firstly,　and　the　data　flow　of　the　context-aware　on　the　AmI　environment　was　analyzed　as　well,　so　multi-agent　system　based　(namely　MAS-Based)　architecture　of　AmI　system　was　proposed.　Meanwhile,　an　AmI　experimental　system　(namely　AmI-Space)　built　on　the　MAS-Based　architecture　was　expounded,　and　the　identity-aware　agent　being　part　of　the　AmI-Space　was　described.　It　is　demonstrated　by　practice　that　the　MAS-Based　architecture　was　fit　for　the　characters　of　modularization,　distribution,　scalability　and　complexity　owned　by　the　AmI　computing　units,　and　the　identity-aware　agent　combining　advantages　of　Bluetooth　Ad-hoc　network　and　Ethernet　can　automatically　sense　the　user　identity,　and　a　kind　of　natural　human　computer　interface　for　AmI　system　was　provided.