Regular　EDTA　pillared　Mg-Ni-Al　layered　double　hydroxides　(LDHs)　were　synthesized　by　hydrothermal　method,　using　Mg(NO3)(2)center　dot　6H(2)O,　Ni(NO3)(2)center　dot　6H(2)O,　Al(NO3)(3)center　dot　9H(2)O　and　[CH2N(CH2COOH)(2)](2)　as　raw　materials.　The　title　samples　were　characterized　by　ICP,　Elemental　Analysis,　XRD,　IR,　TG-DSC,　SEM.　The　effect　of　pH　value,　reaction　temperature,　reaction　time　and　molar　ratio　of　raw　materials　on　the　structure　of　EDTA　pillared　LDHs　was　investigated.　The　results　show　that　EDTA　could　be　intercalated　into　the　interlayer　of　LDHs　and　the　Mg-Ni-Al-EDTA-LDHs　with　neat　surface　topography,　good　crystallinity,　and　tight　and　regular　arrangement　between　layers　could　be　obtained　at　the　reaction　systems　pH　value　of　8,the　hydrothermal　temperature　of　140　degrees　C　and　reaction　time　of　24　h.　The　obtained　Mg-Ni-Al-EDTA-LDHs　can　be　used　to　remove　more　than　97%　of　Co2+　from　aqueous　solution　in　a　short　time.　And　pH　value,　absorption　time,　absorption　temperature,　solid　dosage,　initial　concentration　of　Co2+　have　different　effects　on　the　removal　efficiency　of　Co2+　from　aqueous　solutions.