【Abstract】ObjectiveTo evaluate the reliability of quantitative painsensitivity to theopoids method for the predictionof the postoperative analgesic durgs consumption.MethodsFifty ASAⅠor Ⅱmale patients, aged 27-65, with the body mass index range from 18-30 kg/m2 undergoing Dixon were enrolled in this study.All the patient were tested the pain threshold (PT0), pain tolerance threshold (PTT0) by PainVision in a quiet environment as a baseline.After the oxygen for 3 minutes, the target-controlled concentration of sufentanil in effective site was set at 0.2ng/ml, and theTCI was continued for 3 minutes before testing the pain threshold (PT1), pain tolerance threshold (PTT1), and then all the patient were intubated, the operation was maintained by intravenous inhalational anesthesia, and the PCA pump was connected when the operation was over meanwhile the sufentanil injection was stopped.Pain scores, the effective press times and the consumption of sufentanil in 24 hours after operation were recored.ReslutsThe pain tolerance threshold after sufentanil were negatively correlated with the press times of PCA (r=-0.31) and the consumption of sufentanil (r=-0.34), the increase of pain tolerance thresholdafter sufentanil were significantly negatively correlated with the press times of PCA (r=-0.89) and the consumption of sufentanil (r=-0.90). Conclusion ThePainVisioncan be applied to evaluatethe quantitative pain sensitivity tosufentanil, and the degree of increase in thepain tolerance threshold after sufentanil can be used to as the main parameter topredict the demand of postoperative analgesic drugs.