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目的：比较螺旋CT三维重建与磁共振水成像（MRU)对上尿路梗阻的诊断价值。方法随机选择100例经超声怀疑为上尿路梗阻的患者，分别进行螺旋 CT三维重建和MRU，以手术结果作为金标准,评价其对泌尿系梗阻诊断的价值。结果行螺旋CT三维重建和MRU各50例，其中螺旋 CT三维重建清楚显示梗阻部位、梗阻程度、梗阻性质及梗阻周围组织结构，与手术结果对比符合率达100%，MRU在梗阻部位、梗阻程度与手术结果符合率同螺旋 CT三维重建一致，但梗阻性质与手术结果符合率略低于螺旋CT三维重建。结论螺旋CT三维重建和MRU对上尿路梗阻均有良好的诊断价值，虽然MRU在梗阻性质的判断上比螺旋CT三维重建阳性率低，但因其不接触射线，不需碘对比剂，仍是青少年和孕妇的首选。“,”Objective To compare spiral CT with Magnetic resonance imaging (MRU) on the diagnosis of upper urinary tract obstruction. Methods 100 patients were randomly selected by ultrasound in suspected upper urinary tract obstruction,by three-dimensional reconstruction of spiral CT and MRU respectively,the operation result as the gold standard,evaluate the diagnostic value of urinary tract obstruction. Result row spiral CT and MRU 50 cases,of which three-dimensional reconstruction of spiral CT clearly showed the site of obstruction,the degree of obstruction,the obstructive nature and obstruction of the surrounding tissue structure,compared with the surgical results in line with the rate of 100%,the MRU in the site of obstruction,the degree of obstruction and surgical results in line with rates as spiral CT three-dimensional reconstruction,but the obstructive nature of the surgical results in line with the rate slightly lower than the three-dimensional reconstruction of spiral CT. Conclusion spiral CT three-dimensional reconstruction and MRU on upper urinary tract obstruction has good diagnostic value,although MRU in judgment of obstructive nature than the three-dimensional reconstruction of spiral CT positive rate is low,but because it does not contact the ray,without iodine contrast agent,is stil the first choice for adolescents and pregnant women.