Abstract: CO₂ capture, oil-flooding and storage (CCUS-EOR project) can achieve carbon sequestration while improving oil recovery, which is of great significance for ensuring national energy security and achieving the "dual carbon" goals. By reviewing the foreign and domestic development history of CCUS-EOR project, the paper systematically elaborates the technological progress and engineering practice status in terms of CO₂ capture, oil-flooding and storage, and points out the next development direction of CCUS-EOR project. For CO₂ capture technology, this paper analyzes the principles, technical characteristics, and application scenarios of pre-combustion, post-combustion, oxygen-rich combustion, and other new carbon capture technologies, and points out that high capture costs and insufficient technological innovation are the main issues restricting the commercialization process of CO₂ capture technology. Moreover, an in-depth analysis is performed on the technological development trend of CO₂ oil-flooding and storage from immiscible flooding, miscible flooding to high-pressure miscible flooding in China. The development concept of CO₂ high-pressure miscible flooding and storage in terrestrial sedimentary reservoirs has been innovatively developed with a focus on improving the phase mixing of crude oil and expanding sweep efficiency, thus forming the reservoir engineering design technology for CO₂ oil-flooding and storage, which involves well pattern and spacing optimization, water-gas alternation, injection-production coupling, and chemical sealing. Additionally, relevant supporting technologies such as long-distance pipeline transportation, efficient injection and safety monitoring are also formed. In response to the challenges and major technical demands faced during CCUS-EOR project development in China, it is proposed to vigorously develop efficient and low-energy CO₂ capture technologies for low concentration gas sources, key supporting technologies for collaborative optimization of CO₂ oil-flooding and storage, as well as optimization technologies for matching CO₂ emission sources with sources and sinks in petroliferous basin, and provide breakthrough direction for the construction of a CCUS full chain industrial cluster system, thus providing support for achieving the large-scale commercial application of CCUS-EOR project.