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目的：观察超声定位法和超声引导法在血液透析中心静脉置管中的差异。方法选取需要行中心静脉置管的血液透析患者168例，随机分成超声引导穿刺组（引导组76例）和超声定位组（定位组92例），分析两组患者在置管时间、一次成功率、并发症和血液透析平均血流速的差异。结果与引导组相比，定位组穿刺时间明显缩短（P 0.05）。定位组患者股静脉置管可获得更高的血流速（P 0.05）。两组均未出现并发症。结论与超声引导中心静脉置管相比，超声定位法置管时间更短；超声定位法股静脉置管可获得更高的透析血流速。“,”Objective To observe the difference between ultrasound position and ultrasound guidance during central venous catheterization in dialysis patients. Methods One hundred and sixty-eight dialysis patients were randomly divided into ultrasound position group(UPG,n =92)and ultrasound guidance group(UGG,n =76). Duration of operation,the first success rate,complica-tions and mean blood flow in dialysis were compared between the two groups. Results Compared with UGG,UPG were decreased in duration of operation(P 0. 05). In mean blood flow in dialysis,UPG was increased in femoral vein catheterization compared with UGG(P 0. 05). There was no complication in the two groups. Conclusion Compared with ultrasound guidance,ultrasound position were decreased in duration of operation during cen-tral venous catheterization. Mean blood flow in dialysis were increased in femoral vein catheterization by ultrasound position.