Poly(1-vinyl-2-pyrrolidone-co-acrylic acid-co-N-isopropylacrylamide) hydrogels were obtained by free radical polymerization in water using ammonium persulfate(APS) as an initiator at 92℃ for 12hrs. The swelling ratio of the hydrogel with the composite of AAc/VPy was superior to the hydrogel which composed of AAc/NIPAm. On the other hand, The hydrogel with AAc/NIPAm excelled the hydrogel of AAc/VPy in electroresponse. Particularly, the hydrogel with the composite of AAc/VPy/NIPAm (7/2/1) showed a maximum bending angle in the NaOH electrolyte as well as satisfied with swelling ratio.