  In this paper we characterize Li-Yorke chaotic composition operators on
Orlicz spaces. Indeed some necessary and suffcient conditions are provided for
Li-Yorke chaotic composition operator C' on the Orlicz space Lp. In some cases
we have equivalent conditions for composition operators on Orlicz spaces to be
Li-Yorke chaotic. The results of this paper extend similar results in
Lp-spaces. Our results are essentially based on the results of [4].
