The burden profile distribution in the radial direction of the blast furnace determines the gas flow passage,thus it is of vital importance for stable and economical operation of a blast furnace.In this study,an experimental bell-less top charging model was built on a 1:15 scale of 5800m3 blast furnace in Shasteel to investigate how burden layer behaves inside the large scale blast furnace.To keep the same similarity condition between the cold charging model and the actual blast furnace,the particle size distribution,burden falling trajectory,and the U/Umf were kept the same.Automatic charging of materials into the cold model is done by a rotating distributor at preset charging and blowing parameters which are determined by similarity condition.By making use of this model furnace,the burden layer distribution in the radial direction of 5800m3 at four stable operation periods was reproduced.The result shows that with increase of center coke amount,the slope angle decreases and less coke is pushed to the center part of blast furnace,while large amount of center coke leads to a large center coke column and result in a low gas utilization ratio in actual blast furnace operation.Furthermore it is found that great non-uniformity of the descent velocity in the radial direction exists,40%in difference between the wall and center part.