Atanassov introduced the notion of intuitionistic fuzzy sets as a generalization of the notion of fuzzy set. In this paper we introduce the concept of Atanassov's intuitionistic fuzzy ideals of po-$\Gamma$-semigroups in order to obtain some characterization theorems. Operator po-semigroups of a po-$\Gamma$-semigroup have been made to work by obtaining various relationships between intuitionistic fuzzy ideals of a po-$\Gamma$-semigroup and that of its operator semigroups.