Abstract: The conducting master batch was prepared by the copolymerization of polyether ester powder containing metallic salt and PET chips,then was blend-spun with polyester chips to produce conducting PET fiber.The effects of different contents of conducting master batch on the electrical resistivity,mechanical properties,weight reduction ratio after washing,crystallinity and dyeing properties of the conducting fiber were studied.The morphology and conducting mechanism were preliminarily discussed.The results showed that the conducting PET fiber prepared by industrial spinning plant exhibited a resistivity of 1.43×(10~5 Ω·cm) when the conducting master batch concentration was 38% by weight.The mechanical properties,the weight reduction ratio after washing,dyeing properties of the fiber were excellent.