A shaft furnace was used to secondary heat the blue-cokes which were manufactured by different temperatures of carbonization furnaces at the medium heating rate (10℃/min) and final temperatures of 800, 900, 1200, and 1600℃, as a way to simulate the state of the blue-coke during the downward movement of the upper part of the ferrosilicon furnace. The physical and chemical structure and reactivity changes of the incoming blue-coke at different heat treatment temperatures were studied by using nitrogen adsorption, Raman spectroscopy, and thermogravimetric analysis, and the key aspects of the blue-coke affecting the furnace condition were analyzed with the results of industrial experiments. The results showed that with the increase of heat treatment temperature, taking 800 and 1200℃ as the turning points, the specific surface area and pore volume of blue-coke increased, then decreased and then increased until stable; the defects and amorphous structures in carbon chemical composition gradually changed into ordered carbon structures; the reactivity of blue-coke gradually became worse; and taking 1200℃ as the turning points, the resistivity decreased in stages. As the heat treatment temperature increases, the difference in pore structure, carbon chemical composition, reaction properties, and resistivity among different blue-cokes decreased. When the secondary heat temperature was higher than about 1600℃, the pore structure, carbon chemical composition, reaction performance, and resistivity of different blue-coke tend to be stable. In the upper part of the ferrosilicon furnace, the overburning of the blue-coke with a well-developed pore structure and better reaction performance after feeding into the furnace lead to the deterioration of the mechanical strength of the blue-coke and the increase of the charcoal consumption, which were the main factors affecting the difference of the smelting effect of different blue-cokes in the furnace. In the lower part of the ferrosilicon furnace, the physical and chemical properties of blue-cokes with different mass were similar, which was no longer the main factor affecting the furnace condition.