A　new　type　of　dehydration　unit　for　natural　gas　was　briefly　described　and　its　basic　structure　and　working　principles　were　presented.　An　indoor　test　rig　for　testing　the　unit　performance　was　set　up　and　the　experimental　results　were　given.　The　results　showed　that　the　unit　could　attain　a　maximum　dew　point　depression　of　about　20　degrees　C　without　any　need　of　external　mechanical　power　and　chemicals.　The　pressure　loss　ratio,　shock　wave　and　the　flow　rate　had　great　influence　on　the　dehydration　characteristics.　From　the　systematic　analysis　of　the　factors　that　affect　the　dehydration　efficiency　of　the　unit,　the　suggestions　for　improving　the　unit　are　put　forward.