Abstract: In order to improve the efficiency of core cleaning, a practical core cleaning method based on CO₂ dissolved gas drive was developed. The method added vacuum-pumping, CO₂ pre-cleaning and solvent recovery to the method designed by Stewart in 1952. Then, the effect of core cleaning was observed through a series of experiment with the employment of DGO-1 type CO₂ dissolved gas drive core cleaning device which was self-made. The results of core cleaning of 6 rocks with different porosities and permeabilities showed that the fluorescence level was less than 3 and the porosity and permeability were steady after 6-10 circles. The effect met the standard SY/T 5336-2006. The period of core cleaning with the employment of the new method was 2-3 days, which was less than that of Soxhlet extraction device (2-3 weeks or longer). Since the method had the characteristics of clear principle, simple device, good operability, high efficiency and was environmental-friendly, it was recommended to popularize in rock physics lab.