Abstract: Co-woven-knitted (CWK) fabric is produced using glass filaments as inserted yarns and high tenacity polyester as stitch yarn. Tensile tests are carried out in the wale and course directions. The mechanical properties of the fabric are investigated by analyzing the stress-strain curves. The results revealed that woven structure bear high load in low elongation to failure, and then, the knitted structure commits the low load in high elongation until it damage. Interweaving between warp and weft yarns leads to large buckling of them and low strength utilization for warp and weft yarns. Intermeshing of stitch yarn also leads to low strength utilization for stitch yarn.