There are broad prospects of CO

2

flooding for enhancing oil recovery and greenhouse gas storage. In this paper

we reviewed the development history and brief situation of CO

2

flooding at home and abroad

analyzed the development status of CO

2

immiscible flooding and CO

2

huff and puff

and summarized the phase state of CO

2

flooding

oil displacement mechanism evaluation and optimization design technology of CO

2

flooding reservoir engineering. The design focused on improving oil displacement efficiency and sweep efficiency

controlling viscosity index and gas breakthrough

achieving miscibl

e or near-miscible flooding

and optimizing well pattern and injection parameters in combination with reservoir characteristics. It was pointed out that CO

2

near-miscible flooding and increasing sweep volume were the development trends of CO

2

flooding. WAG

foam flooding

fracture sealing and local gravity flooding were important means to prevent gas channeling. On the basis of summarizing the current CO

2

flooding technology and field experience at home and abroad

the top-level design of combination of CO

2

flooding and CO

2

geological storage should be done according to different types of reservoir characteristics.