Reinforced concrete shear walls coupled by beams are very efficient systems for resisting lateral loads in tall structures. During earthquakes, structures are exposed to cracking and yielding of some structural element leading to the necessity of performing nonlinear structural analysis. A nonlinear model for the analysis of coupled shear walls under earthquake ground motion is used in this paper. The model is based on elasto-plastic behavior of concrete in compression and takes into consideration the cracking process. A coupled shear wall of multi-story building is studied under the effect of different parameters. Three parameters are taken into consideration: connecting beam depth, amount of vertical steel reinforcement, and floor mass. A nonlinear finite element program previously developed by the authors is used in this1 study. The results include the time history of displacements, stresses and cracking pattern at different time increment. The results show that including the nonlinear effect in the analysis is very important, where significant changes in results after cracking are observed. Also, the results show that there is a specific depth after which there will be no change in the coupled shear wall behavior. The effect of steel reinforcement and floor mass is also demonstrated.