Triangle and trilobal polyester fully drawn yams ( FDY) of 55 dtex/36 f were prepared by direct melt-spinning process. The production process was discussed. The results showed that the spinning process was smooth and the fiber had high quality with clear cross section shape as the process conditions were as followed: triangle and trilobal spinneret, nipple oiling, spinning temperature 291℃, cross air blow speed 0.40 -0.45 m/s, spinning speed 3 200 -4 200 m/min, the first roll temperature 69 -90℃, the second roll temperature 126℃. The triangle and trilobal polyester FDY had the breaking strength of 4.21 and 4.08 cN/dtex, elongation at break of 31. 74% and 30.44% , yarn irregularity of 0. 92% and 0. 86% , and boiling water shrinkage of 7. 59% and 7. 35% , respectively.%采用熔体直纺技术生产55 dtex/36 f三角形和三叶形涤纶全拉伸丝(FDY),探讨了其主要的生产工艺.结果表明:采用三角形和三叶形喷丝板,油嘴上油,纺丝温度291℃,侧吹风速度0.40 ～0.45 m/s,纺丝速度3200 ～4 200 m/min,热辊一辊温度69～ 90℃,二辊温度126℃,纺丝过程稳定,纤维截面形状清晰,产品质量优良；三角形与三叶形涤纶FDY断裂强度分别为4.21和4.08 cN/dtex,断裂伸长率分别为31.74％和30.44％,条干不匀率分别为0.92％和0.86％,沸水收缩率分别为7.59％和7.35％.
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