Two kinds of molecular sieve materials, TC-5A and PSA-5A, were produced to satisfy with special requirement of manned space flight. Their CO_2 adsorption performances were investigated and compared through two experiments, the thermo gravimetric analysis(TGA) experiment and packed bed column experiment. Besides, some kinetic equations were compared according to the TGA experimental data, and their errors were analyzed. Finally, the classic linear driving force(LDF) model is improved to the new Avrami’s model, and two models are analyzed based on the packed bed data. The TGA data shows that the CO_2 loading has an approximately linear relationship with the CO_2 concentration, and the best fit adsorption temperature range is from 283 to303 K. The packed bed column results show that water vapor in air can affect the CO_2 adsorption performance badly. The new Avrami’s model is proved more suitable to reflect the complex adsorption mechanism for two molecular sieves. The materials are proved having much better adsorption capacity than the other adsorbents with room temperature and low CO_2concentration(61.0% in volume), and they can meet the aerospace requirements. This work will benefit the optimal design and simulation of the air revitalization(AR) system for Chinese manned spacecraft. Two kinds of molecular sieve materials, TC-5A and PSA-5A, were produced to satisfy with special requirement of manned space flight. Their CO_2 adsorption performances were investigated and compared through two experiments, the thermo gravimetric analysis (TGA) experiment and packed bed Finally, the classic linear driving force (LDF) model is improved to the new Avrami’s model, and two models are based on the TGA experimental data, and their errors were analyzed. packed bed data. The TGA data shows that the CO_2 loading has an approximately linear relationship with the CO_2 concentration, and the best fit adsorption temperature range is from 283 to 303 K. The packed bed column results show that water vapor in air can affect the CO_2 adsorption performance badly. The new Avrami’s model isarently more suitable to reflect the complex adsorption mechanism for two molecular sieves. The materials are prove d having much better adsorption capacity than the other adsorbents with room temperature and low CO_2concentration (61.0% in volume), and they can meet the aerospace requirements. This work will benefit the optimal design and simulation of the air revitalization (AR) system for Chinese manned spacecraft.