A series of carbamate compounds were synthesized from carbon dioxide, aniline and its derivatives and brominated hydrocarbons, activated by 1,8-diazabicycloundec-7-ene (DBU) in N,N-dimethylformamide. The influences of solvent, temperature, initial pressure, base loading and mole ratios of reactants on the reaction has been investigated using a template reaction of aniline, 1-bromobutane and carbon dioxide. The optimal reaction conditions were obtained as follows: aniline 1.0 mmol, 1-bromobutane 2.0 mmol, DBU 2.5 mmol, initial pressure 0.25 MPa, reaction temperature 70 ℃ and N,N-dimethylformamide 0.5 mL. Under the optimal conditions, 24 carbamate compounds were synthesized with yields of 38%~91%. This mild and fast reaction system provides a highly efficient synthetic method for important carbamate compounds.