Abstract: The construction of CO₂ geological storage GIS (Geographic Information System) basic data platform is an important basis for deploying the CCUS (Carbon Capture, Utilization and Storage) full-chain demonstration project. By studying typical carbon storage data platforms at home and abroad, the characteristics of carbon storage data are analyzed: multi-source, multi-scale, and multi-type. There are several areas that need to be further investigated: the platform function is basically a data storage management display, and a further enhancement of model embedding and dynamic analysis is needed. Research on the synergy between CO₂ storage and energy resources needs to be further strengthened. On this basis, the basic data management and processing platform architecture of CO₂ geological storage GIS is preliminarily designed based on the data of Map GIS spatial database and SQL Server attribute database, and the system is constructed by using the Microsoft. Net Frame development framework and the Web GIS technology. The core logical structure of the system is divided into four layers, namely, resource data layer, technical support layer, business application layer, and user permission layer. There are three peripheral support systems including the security system, management support system and standard specification system. The key technologies of data platform construction include the multi-heterogeneous data fusion of carbon sequestration geological GIS data and three models, i.e., secondary development and import of sequestration capacity evaluation model, source and sink matching dynamic model, and energy and resource collaboration model. Four interfaces are preliminarily designed including the data platform home page interface, thematic maps and results output interface, basin-level results map interface, storage potential - source and sink matching - energy and resources collaborative data analysis interface. The construction of the CO₂ geological storage GIS basic data management and processing platform will provide a scientific basis for the selection of carbon reduction and decarburization solutions at the source, the selection of geological storage sites for CCUS regional large-scale deployment and the implementation of CCUS large-scale demonstration projects.