The　Internet　of　things　is　the　technology　extension　and　expansion　of　computer,　Internet　and　mobile　communication　network.　We　will　strongly　rely　on　the　Internet　of　Things　in　the　future.　The　Internet　of　Things　provides　more　conveniences,　but　it　also　will　face　more　threats.　In　this　article,　we　describe　architecture　of　the　Internet　of　Things,　the　function　of　every　layer　and　what　components　every　layer　need.　Our　emphasis　is　to　analyze　the　threats　for　the　security　and　privacy　at　different　levels　of　architecture　in　the　Internet　of　Things.　©　(2014)　Trans　Tech　Publications,　Switzerland.