The study of symmetry is one the most important and beautiful themes uniting various areas contemporary arithmetic. Algebraic structures are useful in pure mathematics for learning a geometrical object’s symmetries. In order to provide mathematical tool dealing with negative information, negative-valued function came into existence along N-structures. present analysis, notion N-structures applied ideals, especially commutative ideals BCI-algebras. Firstly, several properties N-subalgebras N-ideals BCI-algebras investigated. Furthermore, N-ideal defined, related addition, characterizations established. A condition closed be provided. Finally, it proved that BCI-algebra, every N-ideal.