Let J ⊂ I be two monomial ideals such that I/J is Cohen Macaulay. By associating a finite posets
$P_{I/J}^g$
to I/J, we show that if I/J is a Stanley ideal then
$\widetilde{I/J}$
is also a Stanley ideal, where
$\widetilde{I/J}$
is the polarization of I/J. We also give relations between sdepth and fdepth of I/J and
$\widetilde{I/J}$