Y.Imai and K. Iseki introduced two classes of abstract algebras:BCK-algebras and BCI-algebras([3,4]).It is known that the class of BCK-algebras is a proper subclaass of the class of BCI-algebras. In [1,2], Q.P.Hu and X. Li introduced a wide class of abstract: BCH-algebras. They have shown that the class of bci-algebras is a proper subclass of the class of bch-algebras.In 5
H.S.kim and Y.H.kim introduced the notion of a,be-algebra as a dualization of generation of a bck:algebras. In this paper,we introduced the notion generalized f-derivation in a BE-algebra, and obtain some propertes in generalized f-derivation. Also, we characterized isotone generalized f-derivation and Ker D