The effects of temperature，rate of drawing，crystalline form，and the presence of oli-gomers and water in the polymer on the drawing characteristics of Nylon一6 have been studied．Experimental results indicate that the mechanism of cold drawing of Nylon一6 fibre is in agreement with Lazurkin’s relaxation theory．The authors suggest that cold ．drawing(under Tg) of polycrystalline polymer is a relaxation process of chain segments of the noncrystalline region．When the drawing temperature is higher than Tg，crystalli-zation and recrystallization begin，the relaxation process is mainly due to the segmental motion in the crystalline region．Tg and recrystallization temperature of Nylon-6 fibre are greatly reduced by the plasticizing effect of oligomer and water．Since the segmental motion is constrained by the crystalline region，the drawing characteristics of Nylon-6 fibre in a- and γ-forms are different．The effect of constraint of the more stable a-form is greater cban the meta—stable γ-form．ThUS the γ-form of Nylon-6 is favoured for the drawing of fibre．Time-temperature superposition is sucessfully applied to the drawing characteristics of Nylon-6 fibre. and the W．L．F．equation is satisfied：log aT=一43.3(T—Tg)／(374.8+T一Tg) The master curve SO obtained is valuable for the selection of technical conditions of fibre drawing．