The importance of foundation design for tall buildings is increasing with the size of mats getting larger and thicker to safely support the very large amount of loads. In this paper, the heights and their correspondingly suitable super-structural systems of tall buildings were studied in terms of their effects on the thickness of mat foundations. Four tall buildings have been analysed with three different heights of 100m(25stories), 200m(50stories), and 300m(75stories) and three different super-structural systems of rigid frame, shear wall-frame interaction system, and outrigger system. As a result of analysis, in the case of four tall buildings assumed in this study, the outrigger system among the super-structural systems was considered to be the most effective in reducing the thickness of mats, especially with increasing concrete strength.