Although reinforced concrete technology is continuously witnessing revolutionsthe opening. The software used here is ETABS program. Thirty fiveearthquake records were used as ground accelerations The thickness of shear walls was changed from 0.25 to 0.60 m 250.3, 0.4, 0.5, and 0.60) to get the effect of these increments on theperformance of the structure. As a result of the proposed study, it isconcluded that plans which have shear walls allocated on the outer edgesbehave more acceptable than that haven’t shear walls on the outer edgeswhere the first ones have minimum displacements and minimum interstorydrifts. The increasing in shear wall thickness decreases the displacement ofthe top story as so as the interstory drift while it increases the torsion andbase shear. As an exception for some earthquakes the increment in shearwall thickness causes increment in top story displacement due to theadjacent of the structure fundamental frequency and frequency content ofthese earthquakes. A comparison is carried out between the results produced