Abstract: The tube bursting reason of the G102 tube of high temperature superheater was analyzed. The results showed that the tube bursting caused by long-term overheat, resulted from the thick scale of inner wall peeled, and deposited at the lower elbow of tube, and caused the flow area decrease. The tube bursting caused by peel-off and accumulation of scale was reduced greatly, or even avoided by measuring the scale thickness and peel-off risk assessment of ferritic steel tube.