The objective of this study is investigating the effects of bracing usage on the shear lag, for this reason, ETABS software has been used to model buildings for structural analyses. To study the effects of various braces on the shear lag index, each of the braces is restrained in all the openings once and then they are placed in the frame of the perimeter of the base structure as Mega braces. Results indicate that using braces had a positive effect on the shear lag index in higher stories, as using Mega braces causes more reduction of the shear lag index in all stories except the last story, on the other hand, reduction of the shear lag index depends on the type of chosen bracing system. Finally, according to the results, it can be said among all of the bracing systems, Mega brace V is the best kind according to the reduced shear lag index and the X- Mega brace is also the best system according to the decreased amount of shear lag index and story displacements.