Abstract: The wax deposition tendency and its characteristics in crude oil produce at a CO₂ flooding oilfield block were investigated under various CO₂ partial pressures. The wax deposition rate, wax deposition percentage and wax content were calculated. The characteristics of wax precipitation point curves were also analyzed. The results indicated that both wax deposition rate and wax deposition percentage of crude oil increased with CO₂ partial pressure increasing, while wax content decrease meant wax deposition more significantly. In addition, wax precipitation point of crude oil by CO₂-processed moved in the lower temperature direction, and the wax content was lower than that of unprocessed crude oil.