Abstract: At present, most of the experimental studies on CO₂ huff-puff focus on the evaluation of the conventional huff and puff parameters. There are few experimental studies on CO₂ huff and puff in edge-water heavy oil reservoirs, and even fewer on the coordinated recovery mode of displacement and huff-puff. In order to clarify the effect of CO₂ injection to enhance oil recovery in edge-water heavy oil reservoirs in the laboratory, by taking ordinary heavy oil samples as an example, CO₂ huff-puff experiments were designed and carried out to study the influence of the displacement timing. The development effect of coordinated displacement and huff-puff production mode (pressure-maintaining water injection or gas injection + CO₂ huff-puff) is compared, in which the pressure-maintaining water injection simulates the influence of edge water invasion, and the purpose of pressure-maintaining gas injection is to compare the development effects of water flooding with CO₂ flooding. The experimental results show that there is an optimal value for both CO₂ injection amount and well soaking timing. When the water cut is lower than 50%, the CO₂ huff-puff effect is the best. However, if the two oil production stages of water drive + CO₂ huff-puff are considered, the total recovery efficiency is the highest when the water drive reaches 98% water cut. For the pressure-maintaining water injection or gas injection + CO₂ huff-puff mode, the mechanism of edge-bottom water flooding and CO₂ swelling reduction can be exerted, and the oil displacement efficiency of CO₂ flooding is higher than that of water flooding. The results obtained in this experiment provide some reference for the implementation of CO₂ huff-puff in edge-water heavy oil reservoirs.