Abstract: Basalt mineralization storage technology is an important method in the field of CO₂ geological storage, and it is one of the most promising technologies to achieve safe carbon sequestration, which can be used as an important component of large-scale CO₂ emission reduction. In this study, natural basalt samples from Yangpu, Haikou and Zhangzhou in Hainan Province were collected, and the effects of different temperatures and reaction times on the reaction efficiency of basalt mineralization were explored by high-temperature and high-pressure mineralization reaction experiments, and the rock and solution samples before and after the mineralization reaction were analyzed by characterization techniques such as XRD, XRF, ICP, SEM-EDS and CT-scan. The experimental results show that the reaction efficiency of basalt mineralization increases with the increase of temperature and the extension of reaction time, and the reaction process follows a typical dissolution-precipitation mechanism. Among them, the mineralization effect of the samples in Hainan is more significant, which is suitable for large-scale mineralization and storage practice. In addition, based on the experimental data of indoor mineralization, a more reasonable formula for assessing the storage potential is constructed, and the storage potential is evaluated by taking Hainan as an example, and the results show that the basalt in Hainan has a large carbon sequestration potential, and the potential evaluation method has high credibility and applicability. This study provides an important theoretical basis for the development of basalt mineralization storage projects, in order to promote the development of CO₂ mineralization storage technology.