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A large area of coke called ‘deadman’ is formed in the low part of ironmaking blast furnace. The recognition of the deadman is significant to the evaluation of the performance for blast furnace.1) In recent years, with the increase of smelting intensity, the molten iron flow brings much more heat into the hearth, and therefore the hearth refractory is exposed to high temperature iron and is eroded through thermo-chemical solution such as carbon dissolution into molten iron. This process of the dissolution of C in hot metal is supposed to be affected by the inner hearth state, especially the permeability of deadman.2–4) As a result, the deadman zone plays a crucial role in modern high productivity blast furnaces. The permeability of the deadman is directly related to the coke size distribution and deadman voidage. Therefore, effective evaluation of the coke size and voidage of the deadman is critical for understanding the blast furnace hearth performance and the process optimization. The properties of the deadman are extremely difficult to estimate. In order to understand the deadman state of an Analysis of the Deadman Features in Hearth Based on Blast Furnace Dissection by Comprehensive Image-processing Technique