  In this paper, we present the hidden symmetry behind the
Faddeev-Reshetikhin-Takhtajan-Semenov-Tian-Shansky realization of quantum
affine superalgebras $U_q(\hat {osp}(1,2))$ and add the q-Serre relation to the
Drinfeld realization of $U_q(\hat {osp}(1,2))$ (math.QA/9712011) derived from
the FRTS realization.
