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A semi-interpenetrating network hydrogel with pore structure (P-S-IPN) was prepared by solution polymerization with 4-acetyl acryloyl ethyl acetate (AAEA) and crylic acid (AA) as monomers, polyvinylpyrrolidone (PVP) as the second network and polyving akohol 2000(PEG2000) as a pore-foaming agent. Gold nanoparticle composite hydrogel (GNPs gel) was obtained through in-situ reduction reaction by using P-S-IPN as a template. P-S-IPN exhibits excellent mechanical strength, the maximum compressive strength is 14.0 MPa. The influence of the dosage of PEG2000 on the swelling/deswelling properties of P-S-IPN and GNPs gel was investigated. The pore structures could shorten the time that P-S-IPN takes to reach swelling equilibrium from 170 min to 75 min, improve the ability of P-S-IPN to absorb AuCl4-. The swelling/deswelling properties of GNPs gel under an applied voltage showed when the concentration of NaCl solutions exceed 0.025 mol/L, the hydrogel swells, when the concentration of NaCl solutions is below 0.025 mol/L, it deswells.