The cold spot temperature control system for BAF (Batch Annealing Furnace) has been established in order to reduce energy consumption to improve productivity and to stabilize the properties of products. We improved material quality, increased output, and decreased the annealing cost and homogeneous distribution of cold spot temperature in BAF. The introduction of H2 instead of N2 as atmospheric gas, combined with high convection in BAF, has resulted in a considerable increase in furnace efficiency and material quality. By the low density, high diffusibility, and reducing character of H2, a better heat transfer resulting in uniform material temperature and improved coil surface can be achieved. The results in this study are as follows: Heating time is reduced to one half by increasing the inflow rate of atmospheric gas and changing of atmospheric gas component from HNx(H2: 5 %, N2: 95%) to Ax(2: 75%, N2: 25%) gas. The annealing cycle time is also reduced to 2.7 times. In the case of HNx BAF the cold spot moved to the center after 32 hours of heating, while in the case of H2 BAF it moved from the one-third position of the B coli inside to the center juster after 12 hours of heating, resulting from a heat transfer increase to the radius direction. The temperature in this part is higher than any other parts when cooling. Soaking time at batch annealing cycle is decided by input coil width, and the time for quality homogenization of 1219 mm width coil must be longer by 2.0 hours than that of 914 mm width coil with the same coil weight at H2 BAF, however, it is necessary to make 2.5 hours longer at HNx BAF.