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The adsorption behavior and mechanism of a novel chelate resin, macroporous phosphonic acid resin ( PAR ) for Ni ( Ⅱ ) were investigated. The statically saturated adsorption capacity is 64.3 mg · g - 1 resin at 298 K in HAc-NaAc medium. The Ni( Ⅱ ) adsorbed on PAR can be elated by 0.5mol· L-1 HCl and the elution percentage reaches 96.6% . The resin can be regenerated and reused without obvious decrease in adsorption capacity. The apparent adsorption rate coastant is k298 = 2.6 × 10-5 s -1 . The adsorption behavior of PAR for Ni ( Ⅱ ) obeys the Freundlich isotherm. The thermodynamic adsorption parameters, enthalpy change △ H, free en ergy change △ G and entropy change △ S of PAR for Ni ( Ⅱ ) are 3. 36 kJ· mol-1 , - 5.47 kJ· mol - 1 and 29.6J·mol-1 · K- 1, respectively. The apparent activation energy is Ea =12 . 2 kJ · mol-1 The molar coordination ratio of the functional group of PAR to Ni( Ⅱ ) is about 4: 1. The adsorption mechanism of PAR for Ni( Ⅱ ) was examined by a chemical method and IR spectrometry.rn