To　date,　water-based　ionic　polymer　metal　composite　(IPMC)　is　just　regarded　as　a　kind　of　electroactive　material,　whereas　humidity　is　traditionally　regarded　as　a　disadvantageous　factor,　the　change　of　which　negatively　influences　the　performance　of　the　IPMC.　However,　the　deformation　of　the　IPMC　is　greatly　sensitive　to　ambient　humidity,　and　can　be　enhanced　dramatically　by　changing　the　humidity.　In　this　study,　a　novel　actuation　mode　is　proposed　to　control　the　deformation　behavior　of　IPMC　by　employing　moisture　as　an　independent　or　collaborative　incentive　source　together　with　the　electric　field.　The　deformation　is　continuously　recorded　under　electric　field　and　electric　field-moisture　coupling　stimulus.　These　results　are　consistent　with　the　view　that　the　bending　properties　of　the　IPMC　are　a　result　of　the　balance　of　osmotic　pressure　and　electrostatic　stress　in　the　membrane,　which　is　greatly　dependent　on　the　change　of　humidity.　Therefore,　development　of　the　coupling-drive　mode　is　of　great　significance　for　the　guidance　of　material　design　and　application　for　the　IPMC.