Abstract: To analyze tall structures with aseismic optimal, we present a mutual affection analysis of tall structures with variable stiffness. Using the equivalent column model, the whole structure is divided into levels. There are only two degrees of freedom. So analysis of tall structures is simplified. Using this method, the freedoms of degrees of the whole structure are greatly reduced. The method can be applies to analysis of tall structures with variable stiffness. The
method is simple and reasonable.

Key words: mutual affection analysis
, variable stiffness, tall structures