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At present, the campaign life of an ironmaking blast furnace (BF) is mainly determined by the life of hearth bottom.1–4) In recent years, the phenomenon of intensified hearth bottom erosion even burning out occurred frequently.5) It was found that the erosion positions and profiles were different for different BFs.5–7) What’s more, the relationships between hearth sidewall temperature and bottom center temperature were complex. For example, both of hearth sidewall temperature and bottom temperature were increased or decreased simultaneously for some BFs, whereas they were opposite for some other BFs, which are still no reasonable explanations. It has great significance to judge the erosion state of hearth bottom and the activity of deadman correctly by solving the above problems. The floating state of deadman is decided by the force balance of deadman. The floating heights of deadman for different BFs are different.8,9) Many workers have researched the phenomena of molten iron flow and erosion profile in hearth bottom, such as dissection investigation,6,7) core sample analysis,7,10) numerical simulation11–14) and so on. Sensitive Influence of Floating State of Blast Furnace Deadman on Molten Iron Flow and Hearth Erosion