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A new modification approach was proposed to prepare the multiwall carbon nanotube(MWNT) / polyethylene terephthalate(PET) nanocomposites.A modified MWNT was chemically reacted with the tougher, polyolefin grafted maleic anhydride The physical properties of these MWNT / PET resin nanocomposite were studied.From the results, adding MWNT can improve the tensile strength and flexural strength when MWNT content was below 2wt%; In thermal properties of nanocomposites, the heat deflection temperature was improved from 80.6℃ to 91.0℃ as the MWNT content was from 1wt% to 2.5wt%.