To solve the problem of the pale color, spun-dyed viscose fiber was treated to improve the color depth using low refractive resin. This research investigated the effects of resin type, dosage of resin, rolling ratio, baking time and baking temperature on color brightness (L value), breaking strength and elongation at break of spun-dyed viscose fiber. In addition analytical instruments such as infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy were employed to study varieties of the chemical structures, surface element composition, crystallization performance, surface topography of spun-dyed viscose fibers after resin finishing. The results show that when the dosage of fabric deepening agent, rolling ratio, baking temperature and baking time are set to 80 g/L, 90%, 150 ℃, and 180 s respectively, the L value of the spun-dyed viscose fiber is reduced to 11.84, and the retention rate of breaking strength and elongation at break are 70.62% and 70.11% respectively. After the resin treatment, crystallinity of the spun-dyed viscose fiber decreases and fiber surface becomes smoother, whereas silicon functional groups on fiber surface are increased.