Abstract: In the operation of circulating fluidized bed （CFB） boiler units, online monitoring of flue gas components is crucial guiding the adjustment of boiler operation parameters. Traditional online monitoring systems, affected by environmental conditions, select monitoring positions far from the furnace area, and the measured flue gas components have problems such as insufficient representativeness, large time lag, and slow response for real-time adjustment in the furnace. By completing the development of an online analysis suitable for high-smoke, high-smoke speed, and high-smoke temperature gas components in the furnace, it is possible to monitor the high-temperature flue components in the furnace online and in real time, which can make up for the shortcomings of traditional methods and more quickly and truly reflect the characteristic parameters of the combustion process the furnace, thus better guiding the operation personnel to adjust the circulating fluidized bed boiler in detail. The research investigates the commonly used monitoring methods and means of CFB, summarizes and analyzes the advantages, disadvantages, and application scope of the principles and methods of various online gas monitoring systems, and uses them to guide the selection of the scheme of the online monitoring technology for high-temperature flue gas components. Combined with the specific engineering application of high-temperature flue gas zoning monitoring technology, the effect is compared and analyzed, and the application results show that the extraction method and one-to-one measurement mode are better in the design of the sampling system, and the component measurement recommends the use of non-dispersive infrared gas analyzer, and the unit with mixed combustion of multiple fuels can choose Fourier infrared gas analyzer to achieve more components. It is suggested to strengthen the intelligent monitoring of the high-temperature flue gas zoning monitoring system to ensure the safe and stable operation of the equipment; under background conditions of fuel variability and operation load variability, by applying the high-temperature flue gas zoning monitoring technology, the data obtained by the system should be included in operation and regulation measures of the power plant, and the methods of detailed adjustment in the furnace should be increased; in the future, more related technologies can be applied and, and the monitoring and control means of the furnace operation process parameters can be perfected.