The tension of warp and weft yams plays an important role in weaving process, such as yam breakage rate and weaving efficiency. They also influence the physical properties of fabric. To investigate the effect bf weft yarn tension in an air - jet loom, five fabric samples were woven from 32/2 Ne polyester – viscose warp and weft yam with five different weft yam tension levels (with average of 30, 35, 40, 45 and 50 cN). Then, they were measured and analyzed for weft and warp density and crimp, the strength and elongation at warp and weft direction, weight, thickness, drape, and abrasion resistance. Statistical analysis revealed that there is a linear relationship between weft yarn tension and investigated fabric physical properties with high correlation.