Abstract: The metal-organic framework of Cu₃(NH₂BTC)₂ was synthesized by solvothermal method with the prepared grafted amine-based trimesic acid as organic ligand. The synthesized adsorbent was characterized by XRD, N₂ adsorption-desorption, thermogravimetry, FT-IR and in-situ FT-IR. The performance of the CO₂ adsorption was studied by the breakthrough curve based on the fixed-bed reactor. The results showed that the amine groups had been successfully grafted into the skeleton of Cu₃(BTC)₂. The CO₂ adsorption capacity of Cu₃(NH₂BTC)₂ was improved to 1.41 mmol/g at 10 kPa and 50 ℃. The improvement of CO₂ uptake might due to the effect of both the physical and chemical adsorption of CO₂.