Hydrogel　is　a　type　of　soft　smart　material　and　is　responsive　to　stimuli.　In　the　development　of　actuation　in　hydrogel,　electrical　actuation　features　a　fast　and　universal　strategy　which　is　favored　in　the　engineering　system.　Due　to　the　difficulty　in　direct　electrical　actuation　in　hydrogel,　in　this　study,　an　indirect　actuation　was　attained　via　a　dielectric　elastomer.　An　aligned　wrinkle　pattern　was　obtained　in　the　hydrogel　upon　a　direct-current　voltage,　and　it　is　reversible.　The　morphology　and　nonlinear　mechanics　of　the　electro-wrinkling　deformation　was　characterized　and　analyzed.　The　optical　property　of　the　wrinkle　in　hydrogel　was　investigated,　demonstrating　a　tunable　blurring　effect　in　optics.　The　electro-wrinkling　performance　offers　a　potential　application　with　soft　and　tunable　optical　property　in　hydrogel-based　actuators.