For studying the retention capacity of β-cyclodextrin super absorbent with Naphthylacetic acid,the β-cyclodextrin graft cross-linked acrylic acid-acrylamide super absorbent polymer with Naphthylacetic acid was polymerized though solution polymerization. Its inhibitory effect on wheat bud,root length and the fresh weight was measured. The structure and the morphology were characterized by Fourier Transform Infrared Spectroscopy and Scanning Electric Microscope（SEM） analysis. The result showed the retention capacity of β-cyclodextrin super absorbent with Naphthylacetic acid was well above the control group. The Naphthylacetic acid cross-linked with β-cyclodextrin super absorbent. The retention capacity of β-cyclodextrin super absorbent with Naphthylacetic acid was well.