CO₂ flooding is one of the effective methods to enhanche the oil recovery of low permeability and ultra-low permeability reservoirs. However，due to the lack of CO₂ gas source in some oil fields，its scale application is limited. For oil fields with abundant （ associated ） flue gas resources，it can be considered to use“flue gas + a small amount of CO₂”to form a multi-component gas for oil displacement. In this paper，the feasibility and adaptability of EOR by multiple gas flooding were explored by carrying out high pressure physical property analysis of multiple gas-formation oil and a series of core displacement experiments of enhanced oil recovery by multiple gas flooding. The results showed that the addition of a certain proportion of CO₂ to the flue gas would significantly improve the solubility of the gas and the ability to swell and decrease the viscosity of crude oil. The optimal multi-component gas composed of 48.9 mol% N2+49 mol% CO₂+2.1 mol% CH₄ was determined by combining oil recovery with oil change rate. The multi-component gas had better adaptability in both low permeability and ultra-low permeability cores. Compared with pure N₂ flooding and pure flue gas flooding，multi-component gas flooding could enhanced oil recovery by 4 percentage points—5 percentage points. The use of multi-component gas flooding can not only further enhance oil recovery，but also realize the rational and efficient utilization of flue gas，associated gas and other resources，which has important practical meaning.