The　energy　consumption　of　the　air-conditioning　system　in　the　Internet　Data　Center　(IDC)　occupies　about　40%　of　the　total　energy　consumption.　The　thermosyphon　heat　exchanger　using　ambient　energy　is　applied　in　the　IDC　to　reduce　energy　consumption.　By　taking　one　IDC　in　Beijing　as　reference,　the　testing　model　is　set　up　to　experimentally　analyze　the　heat　dissipation　characteristics　and　the　energy　consumption　of　thermosyphon　heat　exchanger　and　air-conditioning　system　respectively.　The　result　indicates　that　the　heat　dissipation　capacity　of　the　building　envelope　takes　about　19.5%　of　the　total　IDC　heat　load　in　Beijing　winter　conditions.　The　average　energy　consumption　of　the　air　conditioner　is　3.5　kW　h-4　kW　h　per　day.　And　the　energy　consumption　of　the　thermosyphon　heat　exchanger　takes　only　41%　of　the　air　conditioner.　The　annual　energy　consumption　reduces　by　nearly　40%.　Besides,　the　effect　of　the　outdoor　temperature　on　the　air　conditioner　energy　consumption　is　remarkable　compared　with　the　indoor　set　temperature.　And　the　air　conditioner　energy　consumption　increases　by　5　%-6%　on　average　when　the　outdoor　temperature　raises　by　1°C.