Abstract: The chelating exchange resin R604，which has iminodiacetic acid (IDA) functional ligand，was used to remove Ni²⁺ from synthetic aqueous solutions. Several factors influencing the ion-exchange adsorption properties，such as the concentration of nickel，the pH value and temperature，were studied. In addition，the adsorption equilibrium，kinetics and thermodynamics were also explored，by which the corresponding models that can well describe the experimental results were obtained. At the same time，an original U-shaped continuous countercurrent desorption system was setted up for the investigation of the desorption ability of the resin that reached saturated adsorption. The influence of residence time of the resin in the column and the flow rate of desorption solution over the resin on the desorption rate of the resin and the concentration distribution of metal-bearing solution were investigated. Results demonstrated that the chelating exchange resin IDA has a high-performance in the removal of Ni²⁺ in wastewater，and that U-shaped continuous countercurrent desorption system can enrich the concentration of metal-bearing solution，which can greatly save the amount of desorption solution and reduce the desorption time.