Provided is a method for stably operating a blast furnace in which ferro coke is used, by optimizing the amount of the ferro coke to be used. An ore and cokes comprising ferro coke and chamber oven coke are introduced into a blast furnace. The amount of the ferro coke to be used is 2-50 mass% of the cokes. It is preferred that the amount of the ferro coke to be used should be 25 mass% or more. The ferro coke has a particle diameter of preferably 15-40 mm. The ferro coke has an iron content of preferably 10-40 mass%.
