Abstract: Hydrogels can respond to the environmental changes by recognizing and then self-working under slight stimulation of physical and chemical environment，such as temperature，pH degree，ionic strength，electric field，magnetic field，light，pressure，etc. So it is called “smart gel”，“soft mechanism”. Electric field enjoys many obvious advantages，such as operating easily and regulating conveniently，which makes the electric-field-sensitive hydrogels have a broad prospect and potential application. In this paper，the recent researches on several typical electric-field-sensitive hydrogels are reviewed. The response mechanism about electrostatic field and osmolality as well as the applications in artificial worm，chemical valve and bionic actuator are also introduced.