In this thesis dissertation, the parameters of the fabric of different structural characteristics that affect their anisotropy are defined. The anisotropy of mechanical properties was investigated on different fabric samples as a result of the synergy of previously defined structural characteristics and the possibility of predicting the direction and amount of deformation caused by different amounts and strain directions in the fabric. Defined predictors of anisotropy are confirmed by comparing the results of the analysis with the theoretical material model. The aim of this thesis is to investigate the stresses in terms of tensile stretching, Poisson ratio, elastic modulus and shear module on different types of fabric. The values were determined by empirical, standard and non-standard methods. The research has been carried out on an innovative, newly developed device that is an integral part of the dynamometer for measuring the breaking forces of the flat material. Thus, the lateral forces of the fabric were investigated during tensile stress. The influence of anisotropy on fabric deformability in different directions and areas of stress (full stress curve) was investigated until the break. Based on this, the results of this research provided new insights on the behavior of the fabric during tensile and shear stress (Poisson's ratio, modulus of elasticity, shear module), thus giving a certain contribution to previous scientific research. In this doctoral dissertation, anisotropic properties of the fabric were investigated and the deviation of orthotropic behaviour of diagonal structured fabrics was defined. The influence of the tension and crimp on the deformation properties of the fabric was determined. A mechanical model for the description of the tensile test with the side restriction was established and the Poisson ratio, the Youngov modul of elasticity and the shear module were determined throughout the range of stress curves.