Objective: to analyze patients with renal failure and show the most encounter Complication in patients in our locality. Design: prospective study in US evaluation of patients with renal failure. Setting: the study was conducted in the radiological unit, Ibn Senate aching hospital, over the period from October 2005 – October 2006 Methods': all patients were examined by US (3.5 MHZ probe). Main result: A- 34 case (56.7%) male and 26 case (43.3%) female. B- 1case (1.7%) is due obtrusive causes and 59 cases (98.3%) are duetonon -obtrusive causes C- 5 case (8.3%) are acute renal failure and 55case (91.7%) are chronic renal failure. Conclusion: US is of great value in the diagnosis of renal failure and insufficiency and provide Complete information no need for preparing patients therefore it is considered an optional method in diagnosis of renal insufficiency and failure.