Abstract: The large-scale commercial computational fluid dynamics software CFX4.3 was applied to numerically simulate the fume distribution in the top dome of a cowper internal combustion stove of blast furnace with a volume of 1 200 m³ in XinGang of China. The standard k-ε model and SIMPLE algorithm were used in this simulation. The results show that the hot gas distribution in a catenary dome is evener than that in a hemispheroid dome, and the distribution of hot gas is improved to some extent with the dome height increasing.