In this research, we develop the new adsorbent, which can easily control the adsobing/desorbing the heavy metal ion by temperature change. The adsorbent is synthesized by copolymerization of the thermosensitive gel, which reversibly swelling and shrinking and the chelate monomer, which forms the complex with the metal ion by molecular imprinting method. In addition, we intend to make the adsorbent possible to adsorb the object selectively by utilizing the molecular imprinting.