ICPF　(Ionic　Conducting　Polymer　Film)　is　a　kind　of　smart　film　and　has　the　characteristics　of　flexibility,　good　response　and　being　driven　by　a　low　voltage.　In　order　to　illuminate　the　deformation　dynamics　of　ICPF,　the　curvature　of　a　thin　strip　ICPF　under　stepwise　application　of　electric　field　is　formulated　according　to　Flory＇s　gel　swell　theory.　The　interplay　mechanism　of　the　deformation　of　gel,　permeation　of　water　and　the　transport　of　ions　is　described.　A　novel　fish-like　flexible　micro-robot　whose　fin　is　actuated　by　ICPF　is　presented.　According　to　the　Pseudo-Rigid-Body-Dynamic-Model　(PRBDM)　the　frequency　analysis　of　the　micro-robot　is　investigated,　and　then,　the　relation　between　the　structure　parameters　and　the　natural　frequency　of　the　fin　is　theoretically　derived　and　some　analysis　and　experiment　graphs　about　the　fin＇s　angle　displacement　and　angle　velocity　are　performed.