Abstract: PET/EVOH sheath-core fiber was prepared and the optimal spinning parameters were obtained.The PET/EVOH sheath-core fibers with various sheath-core ratios were prepared by changing the content of the PET and EVOH.After testing the mechanical properties and hygroscopicity of this fiber,it was found that increasing the content of PET would increase the tensile strength of the fiber and make the spinnability better;on the other hand,increasing the content of EVOH would increase the hygroscopicity of the fiber.When the sheath-core ratio was 5∶5,the tensile strength of the PET/EVOH fiber was 2.53 cN/dtex and the actual moisture absorption ration was 1.6%,which would provide the good spinnability and the general properties to meet the process demand.