Abstract: The water absorption property and atomic force microscopy (AFM) analysis were studied to discover the relativity of water absorption and construction of original konjac powder, grafted copolymer and regenerator. The results show that the water absorption, speed and reserving percent of the grafted copolymer are affected by the size, the liquid ion concentration, the ambient temperature and water reserving time of the gel. At room temperature, the largest water absorption, water absorption speed and water reserving percent of grafted copolymer are 887 times, 64.7 g•g^－1•min^－1 and 92% in distilled water and 273 times, 27.6 g•g^－1•min^－1 and 84% in tap water respectively. The AFM images of grafted copolymer indicate that konjac grafts acrylic acid and then hydrophilic structure comes into being. During the course of regeneration the three dimensional structure of the copolymer was changed to more regularly. So the water absorption of copolymer is higher than that of konjac, and the water absorption of regenerator is 360 times, higher than that of copolymer.