A worldwide effort to solve a trade-off problem between industrial development and environmental protection is addressed on carbon capture and storage (CCS) technology. Hydrate-based CO2 capture (HBCC) from gas mixtures containing CO2 has gained growing attention as an innovate technology and it is of great significance for reducing anthropogenic CO2 emissions. Previous studies of HBCC include the thermodynamics and kinetics exploitation on phase equilibrium, varied additives for hydration formation, and different separation configurations and applications. Presently, the technology is still in the experimental research stage and there are a few reports for the estimation of energy consumption and comparison with other separation methods. This article overviews the thermodynamic processes and parameters of existing research on HBCC from mixtures of CO2/N2, CO2/CH4 and CO2/H2. The methods for performance evaluation are introduced and a theoretical analysis focusing on the minimum work and 2nd law efficiency was conducted. Finally, the performance windows for various capture technologies are illustrated and compared with HBCC in the 2nd law efficiency, based on the current technological level. The results showed that minimum work of HBCC from CO2/N2 mixture was about 5-7kJ/mol, while that value from CO2/CH4 mixture was around 3-4kJ/mol. For separation from CO2/N2 mixture by hydrate, the main problem was high energy consumption. While for HBCC from CO2/CH4 mixture, the main challenge was how to increase the selectivity of CO2. In comparison with other CCS technologies including absorption and adsorption, HBCC was not competitive considering 2nd efficiency. But the smaller minimum work implied good potential of HBCC though as an innovative but energy-efficient CCS technology.