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The tube structure is one of the most efficient lateral resisting structural system. But as a result of the flexural and shear flexibilities of the frame members, the behavior of the tube structure is complicated by the "shear lag" phenomenon which has the effects of increasing the axial stresses in the corner columns, decreasing those in the inner columns and reducing the lateral stiffness of the structure.The braced tube structure is a solution to increasing the efficiency of the framed tube structure, which is to add the substantial diagonal bracing to the faces of the tube. Due to additional braces, the flexural rigidity of structure is increased and the shear lag effect is decreased. Therefore the structure behaves like a cantilever tube.To analyze the behavior of the braced tube structure under the lateral load, the braced tube model, which adds diagonal members of the various characteristics - location, shape, stiffness - to the framed tube model, is used.