Abstract: To eliminate the deviation of reheat steam temperature on both sides of a boiler during low load operation, the causes leading to the temperature deviation were analyzed by measuring the burner nozzle temperature and pulverized coal density. Results show that the deviation of reheat steam temperature at low load is mainly caused by the uneven distribution of coal powder at mill exit, which produces unbalanced combustion among the burners, and further affects the flame center height around the left and right side walls. At low loads, it is difficult to reduce the difference of ignition distance for all the burners by strengthening the ignition, but it is possible to achieve the consistency by weakening the ignition of partial burners. However, the latter way may result in lowered combustion stability, which needs to be evaluated according to specific furnace conditions in actual application. The fundamental method to solve the problem is to install a coal powder distributor at exit of the coal mill.