This study dealt with the bending-electrostrictive response of segmented polyurethane (SPU) films, which was a promising candidate for a material to be used in polymeric actuators. Electrostriction is the phenomenon that a material is strained due to both Maxwell stress effect and electrostriction effect developed by the applied voltage. When a dielectric material is subject to an electric field, it will experience Maxwell stress caused by the Coulomb force between accumulated charges and electrostriction by the reorientation of polar phase in the material. In order to SPU having large deformation and force, SPU was composed of the soft segment with poly(tetramethylene glycol), the hard segment with 4, 4’-diphenylmethane diisocyanate, and 1, 4-butanediol. Dielectric actuator based on SPU had good mechanical properties, field-induced strain, and force.