an invention relating to an efuse bar code structure and a method of using the bar code structure is disclosed . the bar code structure includes a substrate and a plurality of efuse elements disposed on the substrate and arranged in a form of an array , such that a bar pattern can be formed by the result of whether the fuse of the efuse elements is blown or not . the method of using the bar code structure includes , with respect to a data , fuses of the efuse elements in the bar code structure being correspondingly blown in accordance with an encoding method to form a bar pattern . the efuse bar code structure according to the present invention can be manufactured by using a semiconductor manufacturing process , and thus it has small volume , a high density and may record a huge number of data .