The crystallinity and dyeability of PET filament were studied when the conditions of drawing and heat-setting were varied. The crystaltinity of PET filament was increased as the drawing ratio and heatsetting temperature were increased. The dye uptake and dyeing rate of PET filament were decreased as the drawing ratio was increased. With increasing the heat-setting temperature, however, the dye uptake and dyeing rate were decreased at an early stage, showing the minimum at $160^{circ}C-180^{circ}C$ and then increased above that temperature. The thermal shrinkage of PET filament was decreased as the drawing ratio was increased, while increasing as the heat-setting temperature was increased.