Mordant dyeing method was applied for good levellness and colourfastness in dyeing of nylon microfibre nonwoven fabric. Optimum mordanting conditions such as exhaustion time srior to chroming, chroming time, and temperature were determined. The optimum conditions obtained in this study were exhaustion for 30 minutes before adding chroming agent, adding caroming agent at 80 $^{circ}C$ and chroming for 40 minutes. Wash fastness of nylon nonwoven fabric dyed with mordant dyes was better than that of the fabric dyed with metal complex dyes. Rubbing and perspiration fastness of the fabrics dyed with mordant dyes were satisfactory as well.