In this article, the notion of BL-function on a nonempty set P will be studied and for an arbitrary BL-algebra L and the element l ∈ L, the notions of l-functions and l-subsets will be introduced. Moreover, using these notations, the BL-code CL introduce and some related properties and examples will be provided. Finally, I show that the structure of a BL-algebra and the correspondence BL-code are the same.