Research on collaborative evaluation indexes and methods of CO₂ flooding and storage technology（CCUS-EOR）in reservoir engineering theory of CO₂ flooding and storage is few. Therefore，from the perspective of collaborative design of CO₂ flooding and storage，the design principles of CO₂ flooding and storage reservoir engineering scheme were defined，and the evaluation index system of CO₂ flooding and storage reservoir engineering was constructed. The internal relationships between the evaluation indexes of CO₂ flooding and storage were analyzed，and two new indexes were constructed：CO₂ flooding index and CO₂ storage index. On this basis，the collaborative evaluation index of CO₂ flooding and storage reservoir engineering was constructed，namely the synergy index of CO₂ flooding and storage，the collaborative evaluation model of CO₂ flooding and storage was established，and the collaborative evaluation method of CO₂ flooding and storage was formed.The practical application in low-permeability and tight reservoir test wells shows that the collaborative evaluation method is helpful to clarify the technical policy limits of the key injection and production parameters in the CO₂ flooding and storage reservoir engineering scheme，and the recommended scheme can simultaneously achieve positive oil flooding effect and large storage volume.