Abstract: CO₂ capture from large emission sources such as thermal power plants is of great significance to alleviate the greenhouse effect, climate warming and other issues. CaO-based adsorbent is one of the commonly used adsorbents for cyclic CO₂ capture. Because of its low cost and large theoretical adsorption capacity, the industrial application prospect is very broad. However, with the increase of the number of acidification / calcination cycles, CaO particles agglomerate, the specific surface area of the adsorbent becomes smaller, resulting in the collapse of the pores and the reduction of the pores. At the same time, the generated CaCO₃ will cover the surface of the CaO grains, hindering the diffusion of CO₂ molecules to the active sites inside the adsorbent, and the capture capacity of the CaO-based adsorbent is rapidly attenuated, which seriously restricts the large-scale promotion of the calcium cycle technology. Therefore, improving the sintering resistance of CaO-based adsorbents and prolonging their cycle life have become a research hotspot and technical bottleneck. Loading inert materials such as Mg and Al into natural calcium-based adsorbents can effectively alleviate the attenuation of CaO-based adsorbent reactivity due to high temperature sintering. Based on the research status of Mg and Al inert loaded calcium-based adsorbents at home and abroad, the process flow and sintering mechanism of calcium-based adsorbents for cyclic CO₂ capture were discussed. The effects of synthetic raw materials and methods on the cyclic reactivity of composite calcium-based adsorbents were reviewed. Various synthesis methods have different advantages. The adsorbent particles prepared by sol-gel method are uniformly dispersed and have high reactivity, but the preparation process is complicated and the cost of the adsorbent is high. Although the preparation process of physical mixing methods such as co-precipitation method and wet impregnation method is simple, the dispersion of inert load in the adsorbent is poor, and the degree of reactivity of the adsorbent is limited. In contrast, the combustion synthesis method and the template method are relatively simple and have high CO₂ capture activity, which are effective synthesis methods for inert calcium-based adsorbents. Compared with the single-loaded calcium-based adsorbent, Mg-Al binary loading further optimizes the performance of the adsorbent through synergistic effect. Mg and Al react to form MgAl₂O₄ spinel structure, which builds a more stable inert skeleton, reduces the ineffective formation of calcium aluminate, improves the utilization rate of active CaO, and further improves the capture capacity and cycle stability of the adsorbent. How to determine the optimal synthesis method and synthesis parameters is the research focus in the preparation of inert supported calcium-based adsorbents in the future. On the one hand, the experimental environment is close to the practical application scenario to explore the influence of inert load on the performance of adsorbents in complex environments. On the other hand, focusing on binary and above multi-loads, exploring the synergistic mechanism and load threshold of multi-loads, optimizing the preparation process parameters, exploring natural low-cost precursors, promoting the adsorbent to move closer to the actual application scenarios, and achieving a balance between performance and economic benefits are important development directions in the future.