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In this the study, the effects of the manufacturing process conditions on the properties Thick and Thin Diameteryarns(TTD yarns) prepared with hot plate device in the draw winder were determined. Physical properties including wet shrinkage, tenacity and elongation of the samples were measured and thick and thin effect was analysed with the evenness tester. The results were as the folows: There was little change the wet shrinkage of the TTD yarns in the range of 70oC. 80oC of R1 temperature(lower hot cylinder) with the same Hot Plate(H/P) temperature, but the wet shrinkage of the TTD yarns decreased 5-10% when R1 temperature was 90oC. The wet shrinkage of the TTD yarns decreased with the H/P temperature at the same temperature of R1. There was litle efect of R1 and H/P temperature on the tenacity of TTD yarns. The elongation of TTD yarns increased with R1 temperature at the same H/P temperature. The elongation of TTD yarns increased little bit for the first time and then decreased above that temperature with increasing H/P temperature at the same R1 temperature. The thick and thin effect on the TTD yarns was obvious in 10oC of H/P temperature regardless of R1 temperature, while there was no thick and thin effect on the TTD yarns in 140oC of H/P temperature.