Li4SiO4 absorbent is one of the most promising CO2 absorbents to alleviate the global warming crisis. However, Li(4)SiO(4 )absorbents produced by the traditional solid-state method exhibit poor absorption capacity under realistic low CO2 concentrations. In this work, a two-step modification method was carried out involving acidification to enhance the porosity of absorbents and reducing the resistance of gas diffusion through eutectic doping, aiming to produce modified solid-state Li4SiO4 absorbents with superior performance under a low CO2 concentration. The results showed that the conversion of acidified absorbents is 1.5 times higher than the original solid-state absorbents. It was found that the 10 wt % Na2CO3-doped absorbents well maintain a high conversion (>85%) during 20 multiple absorption-desorption cycles (absorption at 550 degrees C under 15 vol % CO2 for 30 min and desorption at 700 degrees C under pure N-2 for 10 min). It is believed that the greatly improved pore structure by the acidification and the formation of the Na2CO3-Li2CO3 eutectic soft shell by eutectic doping contributed to the performance enhancement of the absorbents.