Framed-tube structure is a generally-used structural type for tall buildings. It’s composed by closely-spaced columns connected with deep spandrel beams at periphery of structures. In the past, the framed-tube structure has developed into tube-in-tube structure, bundled-tube structure and braced-tube structure, etc. We used SAP2000 to model and analysing a tubular structure with pyramid-like shape in this study. In the same time, we changed its parameter and enduing outrigger or bracing to compare with original model in order to understand the shear Lag Effect and characteristics of the structural behavior of the tubular structure with pyramid-like shape. Therefore, the structural behaviors are explored and well understood as the results of this study.