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Wind loads on buildings in realistic environments may be considerably either increase or decrease by interference buildings. It is commonly known as interference effect. This effect depend on the geometry and arrangement of these structures, their orientation with respect to the direction of flow and upstream terrain conditions. It is objective of this paper to study the interference effects of the tall buildings which have the different aspect ratios, upstream terrain conditions, distance between adjacent structures and direction of approaching flow. Two types of atmospheric flow conditions which represent open country (α=0.15) and urban flow (α=0.30) environment were simulated in the wind tunnel. The obstructing model used in this study have the aspect ratio of 2, 3 and 4 and the distances between adjacent buildings are 0.5B, 1.0B, 1.5B and 2.0B, which B is the width of the building. Incident wind directions are 0°, 15°, 30° and 45° to the face of the building. And the above experimental results were compared with experimental data measured on isolated building.