Abstract: The hydrogels based on gelatine cross-linked with sodium carboxymethyl cellulose (CMC-Na) and polyvinylpyrrolidone (PVP) were synthesized through ⁶⁰Co γ-ray irradiation, and the swelling ability, pH-sensitivity, gelatine fraction and the absorbing ability of Cr were measured by the Soxhlet extraction device, Uv-vis spectrophotometer and atomic absorption spectrometer, respectively. The result indicates that it is easy to synthesize hydrogels of gelatine/CMC-Na/PVP with monomer mass proportions of 4∶1∶2, 4∶1∶5 and 2∶1∶5 at the absorbed doses of 15, 25, 35 and 45 kGy at the dose rate of 83 Gy/min, respectively. It shows that the swelling behavior of hydrogels becomes different when either the monomer proportion of raw materials or the absorbed doses vary. The swelling ratio (SR) of hydrogels can be up to 56 at pH=7, while the minimal value is 7 at pH=1, which indicates that the SR of hydrogel is sensitive to pH. The hydrogel of PVP will not be degraded after many years, but the hydrogels of gelatine/CMC-Na/PVP will be degraded within one month. It indicates that the degradation of hydrogels can be accelerated as the nature polymer can be degraded into the hydrogels. The adsorptive capacity of Cr(Ⅵ) is up to 0.539 g/g.