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The hearth of the blast furnace is the starting and ending point of the smelting process, the work state of hearth could influence the campaign life, stable state and hot metal quality of blast furnace.1) It’s hardly to monitor the work state of hearth by direct way, so the auxiliary monitoring method such as thermocouple temperature,2–4) hot metal and slag tapping,5,6) hot metal temperature were used to estimate the work state of hearth.7) With the effective volume of the blast furnace is upsizing in recent years, the effective volume and the hearth diameter of largest blast furnace are reached to 5 800 m3 and 15 m in China, respectively. The numbers of raceway zones are increased from one dozen to several dozens, the amount of hot blast and coal injection rate are different in the various tuyere,8) causing the combustion conditions of coke and coal are different for various raceway zones. Consequently, the flame temperature of raceway zones are different. According to the calculation model of raceway zone,9,10) the gas pressures in different tuyere are also various, causing the size of raceway zones are different, affecting the first gas distributions in the blast furnace hearth. The uniformity and activity of blast furnace hearth are very crucial to produce the high quality hot metal and Uniformity and Activity of Blast Furnace Hearth by Monitoring Flame Temperature of Raceway Zone