Abstract: The frame structure of the wet electrostatic precipitator (WESP) is equipped with a plate reinforcement structure on the outside to form a flue gas channel. When using finite element software for analysis, the setting of the plate reinforcement structure can fully consider the contribution of the plate to the overall structural stiffness, thereby achieving more reasonable design optimization. However, common finite element software does not provide specification verification for plates, so it is necessary to further verify the reliability of the calculation results. By comparing the results of theoretical static calculation and finite element software calculation, the design method of the WESP structure was discussed. Results show that, after making reasonable assumptions about the combined section, the static calculation results coincide with the finite element calculation results, which provides an effective supplement and verification for the application of finite element design.