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Based on the background information previously mentioned regarding the mechanism of sulfuric acid dew point corrosion and its morphological characteristics, detection can be carried out using the following methods: First, on-site sampling and macroscopic inspection – samples are taken from areas prone to corrosion such as economizers and air preheaters, and it is observed whether the corrosion products exhibit a typical layered structure with a loose gray-black outer layer, a gray sedimentary layer in the middle, and a dense white-luminous inner layer, thereby allowing for an initial determination of the type of corrosion. Measure the thickness of the equipment’s pipe walls to identify corrosion-related failure patterns such as uniform thinning of the metal and local perforations. II. Laboratory composition and microscopic analysis are used to accurately determine the sulfur content in corrosion deposits; a high sulfur content is the key factor in identifying sulfuric acid dew point corrosion. The micro-structure of corrosion was observed using a scanning electron microscope (SEM), and the elemental composition of the corrosion products was analyzed with an energy dispersive spectrometer (EDS) to determine the cause of corrosion. III. Online monitoring and simulation verification involve using an acid dew point meter (conductive condensation probe method) to directly measure the sulfuric acid dew point temperature of the flue gas; together with real-time wall temperature data, this is used to determine whether the equipment is in a range where corrosion due to sulfuric acid condensation is possible. The current-carrying method is employed to prepare sulfuric acid dew point corrosion simulation gases, in order to verify the corrosion behavior of materials under corresponding operating conditions and assist in assessing the degree of corrosion. IV. For testing in accordance with reference standards, relevant standards such as GB/T 21508-2008 can be used to ensure the standardization of the testing process and the reliability of the results.