The　pursuit　of　improved　water　purification　technology　has　motivated　extensive　research　on　novel　membrane　materials　to　be　carried　out.　In　this　paper,　one-dimensional　carboxylated　carbon　nanotubes　(CNTs)　were　intercalated　into　the　interlayer　space　of　layered　double　hydroxide　(LDH)　to　form　a　composite　membrane　for　water　purification.　The　CNTs/LDH　laminates　were　deposited　on　the　surface　of　the　hydrolyzed　polyacrylonitrile　(PAN)　ultrafiltration　membrane　through　a　vacuum-assisted　assembly　strategy.　Based　on　the　characterization　of　the　morphology　and　structure　of　the　CNTs/LDH　composite　membrane,　it　was　found　that　the　intercalation　of　CNT　created　more　mass　transfer　channels　for　water　molecules.　Moreover,　the　permeance　of　the　CNTs/LDH　membrane　was　improved　by　more　than　50%　due　to　the　low　friction　and　rapid　flow　of　water　molecules　in　the　CNT　tubes.　Additionally,　the　influence　of　preparation　conditions　on　the　separation　performance　was　investigated　using　Evans　blue　(EB).　Optimized　fabrication　conditions　were　given　(the　concentration　of　CoAl-LDH　was　0.1　g/L　and　the　weight　ratio　of　CNTs　was　2　wt.%).　Next,　the　separation　performances　of　the　prepared　CNTs/LDH　composite　membrane　were　evaluated　using　both　single　and　mixed　dye　solutions.　The　results　showed　that　the　composite　membrane　obtained　possessed　a　retention　of　98%　with　a　permeance　of　2600　kg/(m(2)center　dot　h　center　dot　MPa)　for　EB,　which　was　improved　by　36%　compared　with　the　pristine　LDH　composite　membrane.　Moreover,　the　stability　of　the　CNTs/LDH　composite　membrane　was　investigated　in　100　h　with　no　obvious　permeance　drop　(less　than　13%),　which　exhibited　its　great　potential　in　water　purification.