Abstract: Under the Situation of carbon neutralisation strategy, Hunan Province is facing the pressing energy needs for new energy resource and large-scale energy storage. The eolian sandstone reservoirs in Hengyang Basin in the central Hunan has geological condition for gas reservoir, so it is of great theoretical and engineering significance to study the eolian sandstone reservoir as the site for compressed CO₂ energy storage gas reservoirs. Four first-lever evaluation indicators were selected, including trap conditions, reservoir characteristics, geological safety, and economic benefits, with 17 secondary evaluation indicators in total. The analytic hierarchy process and a multi-factor comprehensive evaluation methods were adopted to establish a quantitative evaluation system for aquifer gas reservior sites. A qualitative assessment of the compressed CO₂ storage potential in the deep aquifers of Hengyang Basin was carried out. It was found that the eolian sandstone in the basin can be considered as a preferred target formation for large-scale gas storage construction, because of its suitable porosity and permeability properties and the advantage of a stable overlying caprock. five trap spaces in Hengyang Basin were evaluated using this evaluation system. The results indicate that one site is suitable for energy storage and four sites are medium-unsuitable, with the challenges of low exploration degree for deep geological structure and strong diagenetic heterogeneity. It is preliminarily considered that the deep aquifers of Hengyang Basin have the potential to construct compressed CO₂ energy storage gas reservoirs with engineering interventions like acidizing and hydraulic fracturing, which can provide stable backup support for regional energy supply. This study could provide scientific basis for the site selection and preliminary evaluation of energy storage gas reservoirs in the deep aquifers of Hengyang Basin in the central Hunan. And it is of great significance for promoting the optimization of the regional energy structure and ensuring energy security.