Abstract: As a widely used carbon capture technology at present, chemical absorption method still has the problem of high renewable energy consumption. In previous studies, we can see a lot of conclusions about new chemical absorbents such as two-phase absorbents and anhydrous absorbents, but there are few reports on the research of oligohydrous absorbents. In order to solve the disadvantages of slow absorption rate, low absorption load and high specific ratio of conventional absorbents, a low-water absorbent with 1, 3−propylenediamine as the reaction agent was constructed. Two phase absorbents were formed by adding different tertiary amine phase separators, non-aqueous solvents and alcoholamine respectively. After being kept at 40 ℃ in a constant temperature water bath, carbon dioxide was sucked into the solution for absorption. After absorption, the performance of the absorbent solution was tested. The two-phase absorbent composed of 1, 3−propylenediamine/Tetramethylenediamine and 1, 3−propylenediamine/Diglyme ether with excellent performance was selected by comparing absorption load, fraction ratio and viscosity, etc. After absorbing carbon dioxide, liquid-liquid phase separation can occur, and the absorption load of 1, 3−propylenediamine/tetramethylenediamine can reach up to 3.85 mol/kg. The proportion of rich phase is 54%. The maximum absorption load of 1, 3−propylenediamine/Tetramethylenediamine was 3.11 mol/kg, and the proportion of rich phase was 75%. Then, the water in 1, 3−propylenediamine/Tetramethylenediamine was replaced by a non-aqueous solvent for testing. The absorption load of 1, 3−propylenediamine/Tetramethylenediamine/Diglyme was 3.69 mol/kg. It is 2.37 times the absorption load of 30%MEA chemical absorbent. And the fraction of the two-phase absorbent was significantly reduced to 39% and the viscosity was reduced to 83.4 MPa·s compared with that of the two-phase absorbent without adding non-aqueous solvent. Only 55% of what it was before joining. The phase separation time is reduced from 7 min to 1.5 min. The significant reduction of fraction ratio and viscosity is conducive to the reduction of renewable energy consumption. After 5 absorption−desorption cycles, the absorption load of 1, 3−propylenediamine/tetramethylenediamine/diethylene glycol dimethyl ether gradually decreased after the second absorption, but the decrease was small and tended to be stable, and the cyclic load was 2.64 mol/kg, which had good repetitive stability. The reaction mechanism after absorption of carbon dioxide can be predicted by nuclear magnetic detection. After absorption of carbon dioxide by 1, 3−propylenediamine/Tetramethylenediamine/Diglyme, 1, 3−propylenediamine reacts with carbon dioxide to form an intermediate carbamate, which recombines with 1, 3−propylenediamine to form carbamate. In the whole reaction, 1, 3−propylenediamine is the main absorbent, and tetramethylenediamine and non-aqueous solvents do not participate in the absorption reaction.