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目的:筛选下肢神经阻滞不全的危险因素。方法:拟行下肢神经阻滞的择期手术患者，记录患者性别、年龄、身高、体重、ASA分级、麻醉前有无躯体疼痛、手术分级、手术体位；根据术中麻醉效果将患者分为2组：下肢神经阻滞完全组(N组)和下肢神经阻滞不全组(I组)。将组间比较差异有统计学意义的因素进行多因素logistic回归分析，筛选下肢神经阻滞不全的危险因素。结果:下肢阻滞不全的发生率为34.6%。logistic回归分析结果显示：BMI(>24.0～27.9 kg/mn 2)、ASA分级(Ⅳ级)、手术分级(三、四级)、手术体位(俯卧位)是下肢神经阻滞不全的独立危险因素，年龄(≥40岁)是保护因素(n P24.0-27.9 kg/mn 2), ASA physical status (IV), surgical classification (grade three and four), and surgical position (prone position) were independent risk factors for incomplete nerve block in lower extremities.Age (≥40 yr) was a protective factor (n P<0.05).n Conclusion:Body mass index, ASA physical status, surgical classification, and surgical position are independent risk factors for incomplete nerve block in lower extremities, and age is the protective factor.