This research is regarding dyeing the nylon fabric, which is highly composed of elastic fibers. After using acid dyes of sapphire blue color, and not fixing process by different leveling agent, analyze the variability of shade on fabric by Datacolor spectrometer. At the same time, the impact of observed how the other leveling agent influences the elastic fibers after dyeing. Next, evaluate optimal dyeing conditions, how nylon fabric with high content elastic fiber work by different kinds of aids. When dyeing high content of elastic fiber nylon fabric by different concentration of acid dye, fabric will smudged seriously at concentration of 1%, 3% dyeing, but more stable by the intermediate concentration. The cationic leveling agent under different concentrations of acid dyes, leveling effect turn out better result than two other types; shade present relatively close to those without leveling agent.