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This paper presented a comparative study of monoethanolamine (MEA) and diethanolamine (DEA) for postcombustion CO2 capture (PCC) process with different process configurations to study the interaction effect between solvent and process.The steady state process model of the conventional MEA-based PCC process was developed in Pro/Ⅱ(R) and was validated with the experimental data.Then ten different process configurations were simulated for both MEA and DEA.Their performances in energy consumption were compared in terms of reboiler duty and total equivalent work.The results show that DEA generally has better thermal performances than MEA for all these ten process configurations.Seven process configurations provide 0.38％-4.61％ total energy saving compared with the conventional PCC process for MEA,and other two configurations are not favourable.For DEA,except one configuration,other process configurations have 0.27％-4.50％ total energy saving.This work also analyzed the sensitivities of three key parameters (amine concentration,stripper pressure and lean solvent loading) in conventional process and five process modifications to show optimization strategy.