To obtain the relationship between crack width and steel corrosion ratio of the structure,and grasp the nondestructive testing technology of it,we adopt the CT scanning technology to test the accelerated corrosion concrete members,and analyze the correlation between crack width and steel corrosion ratio.The results show that the correlation curve of crack width and steel corrosion ratio is in the same trend of other researchers’ curves,but the change rate is different.The curve can be referenced for change law of concrete structure crack width and reinforcement corrosion rate.Meanwhile,the CT scanning technology can be applied to concrete nondestructive testing.