Abstract: Acrylic acid were grafted onto carboxymethyl starch potato starch for synthesizing superabsorbent,analyzed structure and surface morphology of the resins by means of IR,X-ray diffraction analyzer and scanning electron microscope. The optimal process parameters were as follows: the contents of initiator and cross-linking agent were 0. 65% and 0. 06%,the neutralization degree of acrylic acid was 50%,total water consumption 60 mL; the mass ratio of potato starch to acrylic acid was 1: 12. Under this condition,the pure water consumption is as high as 2820 g/g. This high water absorbing resin in the 120 min basically reached the water balance,the resin can be used in the range of pH = 4~10 and higher temperature condition.