Hand characteristics of New Synthetic Fiber Fabrics have something to do with mechanical properties of fabric. But the maximum tensile load according to various kinds of fabrics must be oaken into consideration by use of KES-FB system. which measures hailed characteristics and mechanical properties of fabric. This paper surveys tensile deformation region which has an effect on the hand of polyester fabric as basic study on hand characteristic of Uew Synthetic Fiber Fabrics. And relationship between tensile characteristics of polyester fabric and structural parameters of yarn and fabric is analyzed. So this study carries on the relationship between the mechanical properties of polyester fabric and fabric structural parameters such as fineness, twist level. fabric density and weave structure. The other objectives in this work are to investigate the effects of the region of the tensile deformation according to the weave structure related to an effect of the fabric structural parameters on the tensile properties of polyester fabric as a basic study on the hand characteristics of New Synthetic Fiber Fabrics.