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透析患者普遍存在容量超负荷，准确地判断透析患者的容量状态非常重要。容量超负荷与透析高血压、左心室肥厚密切相关，容量不足又可导致低血压和残余肾功能下降。生物电阻抗分析是相对理想的检测容量状态的方法，具有简单、无创、价廉、重复性好、准确等特点，有望在透析患者容量状况的监测和营养状态的评估中占据重要地位。生物电阻抗分析在评估患者容量状态时能提供细胞外液、细胞内液及体液总量的客观数据，还能对人体成分的变化进行监测。“,”Volume overload is a common problem in dialysis patients.Assessment of body fluids in dialy-sis is an important issue in the treatment of renal failure .Overhydration is related with hypertension and left ventricular hypertrophy and dehydration leads to hypotension and reduction of residual renal function .Bioel-ectrical impedance analysis( BIA) is a relatively ideal method to measure fluid status,with the advantages of easy,noninvasive,inexpensive,repetitive and accurate compared with other methods for body fluids analysis, thus is expected to play an important role in the monitor of the fluid status and assessment of nutrition status of the dialysis patients.BIA provides objective information in assessment of extracellular,intracellular and total body water( ECW,ICW,TBW) of the patients.In addition,it also can be utilized to monitor the change of body composition.