In our previous research [1-3], we conducted the batch-type drawing of undrawn poly(ethylene terephthalate) (PET) filament in ethanol, and observed the formation of multiple necking, reduction of tensile stress for drawing, infusion of ethanol into filament and occurrence of solvent-induced crystallization. In case of drawing in ethanol with dissolved dye, infusion of dye molecules into PET filament also proceeded. In this manner, simultaneous fiber structure formation and dyeing were successfully accomplished at room temperature. To explore the possibility of applying this mechanism to industrial process, undrawn PET filaments were prepared at the take-up velocity of 400 m/min, and continuous drawing of the produced PET filament was carried out in ethanol using a set of rollers of different rotation speeds. An ethanol-flowing glass channel was placed between the two rollers. In situ observation of the drawing process using a high-speed camera revealed the formation of multiple necking in ethanol. Length of the undrawn part decreased while that of the drawn part increased gradually with the increase of distance from the feed roll. As a result, averaged moving velocity of the filament also increased continuously in the drawing process. Effect of drawing conditions such as total draw ratio and drawing speed on necking behavior was investigated in detail through the evaluation of the number of necking points in unit length. Keywords: Poly(ethylene terephthalate) fibers, continuous drawing in ethanol, multiple-necking References 1. R. Khanum, W. Takarada, A. Aneja and T. Kikutani, Polymer 59, 26-34 (2015). 2. R. Khanum, D. Go, W. Takarada, A. Aneja and T. Kikutani, Polymer 70, 19-29 (2015). 3. R. Khanum, D. Go, W. Takarada, A. Aneja and T. Kikutani, SEN’I GAKKAISHI 71, No. 9, 273-283 (2015).