The boiler which uses the gas reburning technology was taken as a physical model to simulate the cold flow field characteristics in the furnace.A standard k-ε two-equation turbulent model was introduced,and the mathematical model was verified by the cold state test results.The results show that the deviation between the cold test results and the simulation value is about 5%~10%.So,the model can well simulate the actual boiler flow field conditions.The cyclone zone will stretch along the direction of furnace height after increasing the reburning spout,which is conducive to lengthen the furnace flame fullness.The diameter of the imaginary inscribed circle of the eight layout reburning jet is 66% larger than that of the corners arrangement.Moreover,by the former layout,a recirculation zone is formed in the fire back side of the vents,and the reburning airflow improves the coverage of the updraft.When the reburning amount is 5%,the reburning airflow can't be mixed with the furnace updraft fully.The best reburning amount is 15%,and the height of the reburning zone of about 3 600 mm is a reasonable design.Increasing the distance of the reburning zone has little effect on the flow distribution.