Carbon　nanotubes　were　dispersed　in　water　or　tert　butyl　alcohol　(TBA)　after　they　were　treated　by　acid.　These　two　kinds　of　suspensions　were　dried　by　oven　or　vacuum　freeze　dryer.　Scanning　electron　microscopy　(SEM)　and　UV-Vis　spectrophotometer　were　used　in　characterizing　the　morphology　and　re-dispersibility　of　CNTs　before　and　after　drying　processes.　The　results　show　that　when　the　dispersing　agent　is　water,　the　re-dispersibility　of　CNTs　dried　by　vacuum　freeze　dryer　is　worse　than　that　by　oven.　However,　when　TBA　is　used　as　the　dispersing　agent,　the　re-dispersibility　of　CNTs　dried　by　vacuum　freeze　dryer　is　better　than　that　by　oven.　It　is　also　shown　that　it　is　better　to　choose　TBA　as　the　dispersing　agent.　Comparatively,　optimal　re-dispersibility　of　CNTs　could　be　obtained　by　vacuum　freeze-drying　method　with　TBA　as　dispersing　agent,　which　could　reach　91.2%　of　the　dispersity　of　the　original　acid-treated　CNTs　suspension.　This　should　be　attributed　to　the　fact　that　when　the　dispersing　agent　is　suitable,　vacuum　freeze-drying　could　decrease　the　aggregation　caused　by　capillary　pressure,　hydrogen　and　chemical　bonding.