TECHNOLOGY FOCUS - POLYMERS - Preferred Properties: The gel prevents intermolecular interaction stronger than hydrogen bond between non-bridge polymers during equilibrium swelling by good solvent. The non-bridge polymer has equilibrium-swelling degree with respect to good solvent of 5-1000.Preferred Composition: The content rate of non-bridge polymer is higher than content rate of crosslinked polymer. The content rate of non-bridge polymer is 3.5 to 35 wt.% with respect to weight of good solvent. The content rate of non-bridge polymer is 10 to 40 wt.% with respect to total weight of crosslinked polymer and solvent. The raw material monomer of crosslinked polymer and non-bridge polymer is 2-acryl amide -2- methyl propane sulfonic acid (AMPS), acryl amide (AAm), acrylic acid (AA), methacrylic acid, N- isopropyl acryl amide, vinyl pyridine, hydroxy ethyl acrylate, vinyl acetate, di-methyl siloxane, styrene (St), methyl methacrylate (MMA), trifluoro ethyl acrylate (TFE), styrene sulfonic acid (SS), dimethyl acryl amide, 2,2,2-trifluoro ethyl methyl acrylate, 2, 2,3,3,3-pentafluoro propyl methacrylate, 3-(perfluoro butyl) -2- hydroxy propyl methacrylate, 1H, 1H, 9H- hexadeca methacrylate, 2,2,2-trifluoro ethyl acrylate, 2, 3,4,5,6-pentafluoro styrene and/or vinylidene fluoride. The crosslinking agent used in polymerization of crosslinked polymer, is N,N'-methylene bis acryl amide (MBAA) or ethylene glycol dimethacrylate.The molar ratio of raw material monomer of crosslinked polymer, and raw material monomer of non-bridge polymer is 1:20. The gel has surface layer of an electrolyte polymer. A water absorbing resin removes a solvent from the gel. EXAMPLE - 5 mol/l acryl amide aqueous solution (40 ml) and 0.1 ml/l 2-oxo glutaric acid aqueous solution (50 mul) were mixed and irradiated with ultraviolet ray for 6 hours. A gel having semi-mutual penetration network structure in which non-bridge polymer was penetrated into network structure was formed. The gel had equilibrium swelling degree of 8, non-bridge polymer content rate of 10.5 wt.%, pure water content rate of 88 wt.% and cross-linked polymer content rate of 1.5 wt.%.