Electrically conductive fibers and textiles have wide range of applications such as sensors, anti-microbial and anti-dust clothes, dye elimination from wastewater, anti-electrostatice materials and plastic welding, electromagnetic sheilding etc. In this research work polyester and polyester-lycra fabrics were coated by nickel using electroless technique. The SEM and optical microscopic images indicated the uniformity of the metallic coating on the surface of the both of the fabrics. X-ray diffraction patterns of the fabrics were obtained. Tensile strength testing and electrical conductivity measurements were conducted. Besides, the washing fastness, contact angle, air permeability and electrical sensitivity of fabrics under tensile cyclic loading were measured. In XRD patterns of coated fabrics the peak in 2?=45.3? indicated the existence of nickel on the surface of the fabrics. The crystallite size was smaller for fabrics coated in acidic conditions. The breaking strength of coated polyester fabrics in alkali condition was lower that of acidic conditions. Contact angle of nickel coated polyester fabrics in acidic condition was 143.94? and in alkali condition was 146.37?. Contact angle for nickel coated polyester-lycra fabrics in acidic condition was 148.8? and in alkali condition was 149.53?. For untreated fabrics the water drop has absorbed immediately. Therefore, the results showed a good water repellency for all of the coated fabrics. Electrical conductivity of the nickel coated polyester fabrics in alkali condition before washing was 194.02 s/cm and after washing was 20.26 s/cm. electrical conductivity of the nickel coated polyester-lycra fabrics in alkali condition before washing was 25.66 s/cm and after washing was 0.298 s/cm. The electrical conductivity of the coated fabrics in alkali condition was more than that of acidic ones. According to EDX results phosphorus content of nickel coated polyester fabrics was 8.2 wt% and 5.24 wt% in acidic and alkali conditions, respectively. The phosphorus content of nickel coated polyester-lycra fabrics was 5.21 wt% and 4.14 wt% in acidic and alkali conditions, respectively. Therefore, coated fabrics in acidic condition had medium phosphorus content. For coated polyester fabrics in both acidic and alkali conditions the electrical resistance sensitivity while stretching at five loading periods under 25% elongation showed a regular pattern which is applicable as electrical sensor. For coated polyester-lycra fabrics the electrical resistance sensitivity while stretching didn’t show a regular pattern. Key words coating, electroless, scanning electron microscope, sensitivity, loading period