Flow velocity distribution uniformity is widely applied in many fields

but it has no unified evaluation index till now.A variety of indices play a unique role in their respective field.A comparison between the evaluation indices in different fields was carried out to analyze their respective functions.A theoretical model was applied to figure out relationship between each evaluation indices

which can provide references for selecting evaluation index in future research.Meanwhile

these indices were used in experimental results of velocity distribution in hot blast stove model

to analyze the characteristics that each index reflected in common flow field.