Abstract: To address the vibration problem of the hanging device at the top of the circulating fluidized bed boiler in the one Thermal Power Plant, this paper adopts a method that combines finite element simulation and field measurement, and calculates the natural frequencies of the upper header of the front water wall, the upper header of the side water wall, and the suspension device of the rear wall water wall respectively, and compares them with the excitation frequencies of each hanging device when the boiler is operating, revealing the cause of excessive vibration. Based on this, this paper designs a vibration control scheme that adds a limit device at the middle position of the suspension device, and verifies its effectiveness through field tests. The test results show that the scheme can significantly suppress the vibration of the hanging device, achieving the expected goal. The research results of this paper provide theoretical basis and engineering guidance for the vibration control of the hanging device at the top of the boiler in power plants.