Abstract: With chitosan as raw material, a spherical amination crosslinked chitosan resin with Cu²⁺ vacancy was prepared using template method under microwave irradiation. The structure and morphology of the chitosan resin were characterized by Fourier transformation-infrared and scanning electron microscopy, respectively. The influencing factors on its adsorptivity were also investigated. The results show that the resin has active groups to adsorb metal ions and its surface particles are homogeneous. The adsorptivity of the chitosan resin for Cu²⁺ was up to 326.55 mg/g when the chitosan resin was prepared with the conditions of 3 mL of ethanol, 5 mL of epichlorohydrin, 4.8 mL of tetraethylenepentamine and 3 min of amination.