Superporous hydrogels (SPHs) with interconnected pores of several hundreds micrometers were prepared using radical polymerization of acrylic acid (AA) and acrylamide (AAm) in the presence of N,N’-methylenebisacrylamide (BIS). A gas blowing method using bicarbonate as a foaming agent was applied to introduce the porous structure under different pH conditions (pH 2~7). The pore structures of the prepared SPHs were examined by a scanning electron microscope. The SPHs obtained at pHs of 4.5 and 4.75 were observed to have a interconnected pore structure with homogeneous distribution and swell to an equilibrium state within several minutes. The O2 plasma reactor has been used for surface modification of SPHs. The plasma-treated SPHs showed much faster swelling behavior due to the improvement of surface hydrophilicity. The swelling ratio of SPHs was also enhanced by using a wetting agent, such as triacetin and glycerol, during a washing procedure.