Carbon dioxide is a major greenhouse gas and a cheap and readily available source of carbon and oxygen. It is important to study the chemical conversion and utilization of carbon dioxide. However, due to the thermodynamic stability and kinetic inertness of carbon dioxide, the efficient conversion of carbon dioxide has been a difficult problem for researchers and a challenging topic in the field of green chemistry and catalysis. Carbon dioxide activation is a core issue in its catalytic conversion and a key to achieving carbon dioxide utilization. Based on the use of carbon dioxide, our research team developed a polycondensation reaction of amine compounds with carbon dioxide to prepare a series of polyurea oligomers. Through different post-polymerization reactions, the use range of polyurea materials is broadened, and the synthesis method of polyurea is enriched. In addition, urea derivatives, N-methylamine compounds, cyclic carbonates and other materials have been synthesized using CO2 as a reactant, which provides a potential new approach to solving increasingly serious environmental problems.