Abstract: Based on the modal pushover analysis (MPA) and constant-strength ductility demand spectrum method, the basic solving process of the vertical irregular structure is put forward. Using the modal pushover analysis, the influence of high modes can be taken into account. Using the constant-strength ductility demand spectrum method, the ductility and displacement demand of the equivalent single degree of freedom is obtained, then translate them into the displacement demand of multi degree of freedom system. Using these methods to analyze the examples of typical irregular vertical structures, the results demonstrate that these methods can be used in the calculation of the vertical irregular structure.