In order to provide the basis for the design of the wind load. A 500kV transfer substation whole joint structure in the central Chinese provinces is taken as the engineering background, the 3D solid model of a 500kV transfer substation whole joint structure is established by using the Solidworks three-dimensional modeling software, the mesh generation and modal analysis of the whole joint structure is carried out by using the ANSYS Workbench. The first 20 orders of modal frequencies and modal shapes of the whole joint structure are calculated. By analysis, the distribution law of the first 20 orders of model frequencies and modal shapes are revealed. Aanalysis result demonstrates that the 500kV transfer substation whole joint structure is sensitive to the fluctuating wind load, the lower order model shapes of which can be easily excited by fluctuating wind speed in the horizontal direction.