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In response to recent increases in the price of coking coal, low coke rate operation of blast furnaces has been required in order to reduce ironmaking costs. Because coke functions not only as a reducing agent, but also as a spacer in the blast furnace, low coke rate operation causes various undesirable phenomena, including deterioration of furnace permeability1), channeling2) and delay of the reduction reaction. In turn, this delay of the reduction reaction causes dropping of unreduced FeO,3) heat shortage and expansion of the cohesive zone.4) Therefore, for stable low coke rate operation, it is necessary to improve permeability and reducibility. One method to improve permeability and reducibility at the same time is mixed coke charging in the ore layer. This technique has been examined in various laboratory studies. For example, softening tests under load confirmed that the permeability of a softening sinter layer containing mixed coke was improved by generation of local spaces around the mixed coke,4–6) and that reducibility was improved by promotion of the reaction between the ore and mixed coke.7–10) In a gas flow analysis using a DEM-DFD, a 50% coke mixed condition showed the lowest pressure drop, Evaluating Effect of Coke Layer Thickness on Permeability by Pressure Drop Estimation Model