An Arc Ion Plating (AIP) system was used to deposit diamond like carbon coatings onto polyamide 66 fabrics. Coatings with different thickness were obtained by controlling deposition time. The tensile strength, wear resistance, water contact angle, heat conductive coefficient, fastness to laundering and stiffness of different coated fabrics were measured and compared. The results show that, depositing DLC coatings enhances the stiffness, hydrophobic property and heat conductive coefficient of polyamide 66 fabrics. The stiffness and thermal conductivity of fabric increased with increasing the coating thickness. The tensile strength of coated sample initially increases with deposition time. The sample of 30 minute deposition exhibits a maximum tensile stress of 50.39 N/mm2. The wear resistance of the sample of 10 minute deposition is 212.2% higher than uncoated polyamide fabrics. The DLC coatings effectively change the hydrophilic polyamide 66 into hydrophobic. The stiffness of sample with 40 minutes deposition shows a 17.21% in warp and 45.45% in weft improvement and better than uncoated fabric. It also shows a 25.51% higher thermal conductivity and better than uncoated fabric. However, the accumulated heat during deposition may cause deterioration of polyamide 66 fiber. The coated polyamide 66 fabrics with optimized tensile strength and wear resistance are obtained between 10 to 30 min depositions. These results evidence the feasibility of applying DLC on polyamide 66 fabrics and the other polymeric fiber products for several potential applications.