Understanding deformational processes and related structures at various scales, necessitates an estimate of microstructural and finite strain characterization of deformed rocks. In the current research, 23 collected samples of metaconglomerates, metsediments, and metavolcanics from the Wadi El-Qash region, placed in the Central Eastern Desert of Egypt, were used to quantify the finite strain of quartz, feldspar porphyroclasts, and mafic grains. Finite strain techniques were utilized to produce and analyze 46 thin sections. The metaconglomerate rocks have undergone high to moderate grades of deformation, according to the strain results. Using the Rf/φ and the Fry techniques, the axial ratios in the XZ section vary from 2.20 to 5.40 and from 2.00 to 5.30, respectively. The strain results point out high to moderate rates of deformation of the metaconglomerates, metsediments, and metavolcanic rocks. The direction of finite strain in X axis exhibits shallow WNW dipping and grouping following an N-to-WNW trend in most of the measured samples. The subvertical and subhorizontal foliation related to the short axes in Z axis. The results show that contacts developed in semi-brittle to ductile deformation and the magnitude of strain is the same for all lithologic units that are exposed in the studied area. Also, these results contradict the generally accepted belief that simple-shear deformation is responsible for nappe development in orogens.