||In this study, a sub-micro acrylic acid superabsorbent polymer (SAP) was prepared by using inverse miniemulsion polymerization for the existing micro superabsorbent polymer. The effect of varying the degree of neutralization of acrylic acid, crosslinking agent, dispersant, initiator, monomer/ surfactant ratio, on absorption capacities was investigated. The superabsorbent polymers were evaluated for their free absorption capacities in distilled water, saline (0.9% NaCl), and also absorption under load (AUL). The surface morphology was examined by FE-SEM and the mean particle diameter and its distribution were assessed by using electrophoretic light scattering spectrophotometer. Acknowledgements. This material was based upon work supported by the Ministry of Trade, Industry & Energy (MOTIE, Korea) under Industrial Technology Innovation Program (Grant No. 10048877).