Ionic electroactive polymers(i-EAPs)have attracted great attention for a variety of biomimetic applications due to their impressive large-strain under low-voltage stimulation and air-working capability.However,subjected to the ions diffusion process,response for large strain is usually slow.It still remains great challenge to develop practically viable i-EAPs with both fast response and large deformation.Here we show a novel i-EAP actuator using hierarchically architectured nanocomposite electrodes,in which vertically aligned NiO nanosheets are grown on surface of the graphene-carbon nanotube hybrid film.Large specific surface area and fast ion transmission channel of this porous electrodes enable us to achieve large deformation in quick switching response(18.4 mm per 0.05 s)to low voltage,and high durability upon 500,000 times continuous operations in air.