a sufficient and necessary condition was established for constructing a Bent function in
n+
2 variables from 4 Bent functions in
n
variables.An iterative construction of Bent functions was proposed to construct (
n
+2)-variable Bent functions from
n
-variable Bent functions.The algebraic degree of some Bent functions constructed by the proposed method was also analyzed.The iterative method unifies and generalizes two previous constructions of Bent functions.