Earthquake is a catastrophic event, which makes enormous harm to properties and human lives. Shear walls are used to oppose the horizontal loads that might be incited by impact of wind & earthquakes and give additional stiffness for the structures. R.C walls in residential buildings might have openings that are required for windows, doors or different states of openings. Shear walls can encounter harm around corners of entryways and windows because of advancement of stress concentration under the impact of vertical or horizontal loads. To achieve safe, economic and functional buildings, strengthening of structural members using several methods has gained a great deal of attention in recent years and proved the efficiency in increasing capacity of the shear walls with opening. Strengthening R.C. wall is divided into two main types: pre-strengthening and post-strengthening. Pre-strengthening includes adding extra internal steel bars around openings before casting. On the other hand, Post-strengthening includes using externally bonded FRP sheets with different development lengths and near surface mounted (N.S.M) FRP and steel bars. Comparative study by using Finite element modeling approach '' ANSYS" has been conducted to compare between several methods used in strengthening R.C. wall with openings like prestrengthening and post-strengthening schemes . The proposed F.E. approach has been verified experimentally and mathematically with other experimental programs and design models and given a very good correlation between the model and experimental outputs including load capacity, failure mode, as well as crack pattern and lateral displacement. A parametric study also is applied to investigate effects of increasing the horizontal and vertical CFRP development length. Moreover, influences of re-arrangement of CFRP layers on rehabilitation of concrete shear walls is examined. This research may be useful for improving existing design models and to be applied in practice, as it satisfies both the architectural and the structural requirements.