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The significance of cohesive zone in which softening and melting of iron ore proceed was recognized in the dissection studies of blast furnace in 1970s.1) The cohesive zone usually locates in the middle part of the furnace, from lower part of the shaft down to the tuyeres. It was reported that the cohesive zone is formed in different shapes namely; asymmetric, inverted V-type or W-type,2) depending on the operating condition of the blast furnace. The iron ore layer in the cohesive zone is composed with solid and liquid phases and the liquid phase is soak into the void space among the solid phase. The void fraction in the ore layer decreases and then the gas permeability is deteriorated. The gas permeability of cohesive zone is extremely lower than that of lumpy or dripping zone. In conventional operation of blast furnace, layer structure of burden materials is formed to control the gas flow by charging the ore and coke alternately. The coke layer acts as the ventilation slits in the cohesive zone. Gas permeability of packed bed in the blast furnace determines the limits of the blast volume, and directly limits the productivity. Therefore, it is necessary to optimize the cohesive zone and the structure of the moving bed of burden in the furnace for decreasing gas flow resistance. To mitigate CO2 emissions, blast furnace operation with low reducing agent rate has been actively investigated.3–7) To establish CO2 reduction technology, the COURSE 50 project is considering using hydrogen in a blast furnace as a Influence of Shape of Cohesive Zone on Gas Flow and Permeability in the Blast Furnace Analyzed by DEM-CFD Model