Abstract: The development of wearable flexible fabric sensors is an important part of smart clothes, and it usually was made by different combination of fabric constructions with different materials at present. This article chose the coated carbon fibers (CCFs) which has high performance of conductive and soft to knit an embryonic of fabric sensor. The Single Jersey and Rib 1+1 was chosen as the knitting constructions. Though the repeated tensile test of conductive knitting fabric, we found the relationship of resistance and elongation, and analyzed its conductivity and sensitivity. Research shows that: The resistance of conductive knitting fabric decreased with the increased elongation under tension, and the fitting curve approximates left curve of parabola which has an upward opening. The highest value of GF is 1.52. The sensitivity of Single Jersey conductive fabric is higher than Rib 1+1 one, and the fabric with by none twist yarns has higher sensitivity than the one with twists yarns. The stability and stress relaxation of Rib 1+1 construct fabric are better than Single Jersey one.