In various knitting structures knitted fabrics are characterized in different extensibility (in a course and wale directions)and maximum force to rupture. Various combinations of stitches, tucks, and floats give also different width and length ofknit. The goal of this study is to investigate the influence of different knitting structure elements and their position in theknit on deformation properties of plain weft-knitted fabrics. An investigation was carried out with the fabrics knitted ona basis of rib 1×1, rib 2×2, and rib 1×1×1×2 on a flat V-bed knitting machine in a gauge 10E. It has been established thatextensibility and strength of the knitted fabrics are immediately concerned with knitting structure. In case of transversedeformation, the maximum elongation and strength characterized knitted fabrics, which have in a structure just stitchesor in different order ranged stitches and short floats. In case of longitudinal deformation, the maximum elongation andstrength characterized knitted fabrics which have in a structure tucks.