Abstract: Polymer-supported CuI catalyst was prepared and its catalytic activity was investigated for the 1,3-dipolar cycloaddition reaction. 1,2,3-Triazoles were produced. The influences of reaction conditions, such as solvent, base, amount of catalyst, reaction atmosphere, were studied and optimal conditions were determined. The results showed that the reaction went smoothly to produce 1,4-disubstituted-1,2,3-triazoles at room temperature using PEG/H₂O as solvent. Meanwhile, effect of different substrates were explored. Benzyl and allyl halides were active, and the products were obtained with yields of 72%~94% in 8h; alkyl halides were less active and moderate yields were obtained. The cycloaddition of aromatic halides were difficult. Aromatic iodides gave products with moderate yields at 85℃ in 24 h, while aromatic bromides didn't give any product. The catalyst could be recycled by simple filtration and washing and reused for four times without significant decrease in its activity.